The Information Schema
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- The Information Schema#
- The Schema#
- Data Types#
- information_schema_catalog_name#
- administrable_role_authorizations#
- applicable_roles#
- attributes#
- character_sets#
- check_constraint_routine_usage#
- check_constraints#
- collations#
- collation_character_set_applicability#
- column_column_usage#
- column_domain_usage#
- column_options#
- column_privileges#
- column_udt_usage#
- columns#
- constraint_column_usage#
- constraint_table_usage#
- data_type_privileges#
- domain_constraints#
- domain_udt_usage#
- domains#
- element_types#
- enabled_roles#
- foreign_data_wrapper_options#
- foreign_data_wrappers#
- foreign_server_options#
- foreign_servers#
- foreign_table_options#
- foreign_tables#
- key_column_usage#
- parameters#
- referential_constraints#
- role_column_grants#
- role_routine_grants#
- role_table_grants#
- role_udt_grants#
- role_usage_grants#
- routine_column_usage#
- routine_privileges#
- routine_routine_usage#
- routine_sequence_usage#
- routine_table_usage#
- routines#
- schemata#
- sequences#
- sql_features#
- sql_implementation_info#
- sql_parts#
- sql_sizing#
- table_constraints#
- table_privileges#
- tables#
- transforms#
- triggered_update_columns#
- triggers#
- udt_privileges#
- usage_privileges#
- user_defined_types#
- user_mapping_options#
- user_mappings#
- view_column_usage#
- view_routine_usage#
- view_table_usage#
- views#
The Information Schema#
information schema
The information schema consists of a set of views that contain information about the objects defined in the current database. The information schema is defined in the SQL standard and can therefore be expected to be portable and remain stable unlike the system catalogs, which are specific to PostgreSQL and are modeled after implementation concerns. The information schema views do not, however, contain information about PostgreSQL-specific features; to inquire about those you need to query the system catalogs or other PostgreSQL-specific views.
[!NOTE] When querying the database for constraint information, it is possible for a standard-compliant query that expects to return one row to return several. This is because the SQL standard requires constraint names to be unique within a schema, but PostgreSQL does not enforce this restriction. PostgreSQL automatically-generated constraint names avoid duplicates in the same schema, but users can specify such duplicate names.
This problem can appear when querying information schema views such as
check_constraint_routine_usage,check_constraints,domain_constraints, andreferential_constraints. Some other views have similar issues but contain the table name to help distinguish duplicate rows, e.g.,constraint_column_usage,constraint_table_usage,table_constraints.
The Schema#
The information schema itself is a schema named information_schema. This schema automatically exists in all databases. The owner of this schema is the initial database user in the cluster, and that user naturally has all the privileges on this schema, including the ability to drop it (but the space savings achieved by that are minuscule).
By default, the information schema is not in the schema search path, so you need to access all objects in it through qualified names. Since the names of some of the objects in the information schema are generic names that might occur in user applications, you should be careful if you want to put the information schema in the path.
Data Types#
The columns of the information schema views use special data types that are defined in the information schema. These are defined as simple domains over ordinary built-in types. You should not use these types for work outside the information schema, but your applications must be prepared for them if they select from the information schema.
These types are:
cardinal_number
A nonnegative integer.
character_data
A character string (without specific maximum length).
sql_identifier
A character string. This type is used for SQL identifiers, the type character_data is used for any other kind of text data.
time_stamp
A domain over the type timestamp with time zone
yes_or_no
A character string domain that contains either YES or NO. This is used to represent Boolean (true/false) data in the information schema. (The information schema was invented before the type boolean was added to the SQL standard, so this convention is necessary to keep the information schema backward compatible.)
Every column in the information schema has one of these five types.
information_schema_catalog_name#
information_schema_catalog_name is a table that always contains one row and one column containing the name of the current database (current catalog, in SQL terminology).
Column Type Description |
|---|
catalog_name Name of the database that contains this information schema |
administrable_role_authorizations#
The view administrable_role_authorizations identifies all roles that the current user has the admin option for.
Column Type Description |
|---|
grantee Name of the role to which this role membership was granted (can be the current user, or a different role in case of nested role memberships) |
role_name Name of a role |
is_grantable Always |
applicable_roles#
The view applicable_roles identifies all roles whose privileges the current user can use. This means there is some chain of role grants from the current user to the role in question. The current user itself is also an applicable role. The set of applicable roles is generally used for permission checking.
Column Type Description |
|---|
grantee Name of the role to which this role membership was granted (can be the current user, or a different role in case of nested role memberships) |
role_name Name of a role |
is_grantable
|
attributes#
The view attributes contains information about the attributes of composite data types defined in the database. (Note that the view does not give information about table columns, which are sometimes called attributes in PostgreSQL contexts.) Only those attributes are shown that the current user has access to (by way of being the owner of or having some privilege on the type).
Column Type Description |
|---|
udt_catalog Name of the database containing the data type (always the current database) |
udt_schema Name of the schema containing the data type |
udt_name Name of the data type |
attribute_name Name of the attribute |
ordinal_position Ordinal position of the attribute within the data type (count starts at 1) |
attribute_default Default expression of the attribute |
is_nullable
|
data_type Data type of the attribute, if it is a built-in type, or |
character_maximum_length If |
character_octet_length If |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Name of the database containing the collation of the attribute (always the current database), null if default or the data type of the attribute is not collatable |
collation_schema Name of the schema containing the collation of the attribute, null if default or the data type of the attribute is not collatable |
collation_name Name of the collation of the attribute, null if default or the data type of the attribute is not collatable |
numeric_precision If |
numeric_precision_radix If |
numeric_scale If |
datetime_precision If |
interval_type If |
interval_precision Applies to a feature not available in PostgreSQL (see |
attribute_udt_catalog Name of the database that the attribute data type is defined in (always the current database) |
attribute_udt_schema Name of the schema that the attribute data type is defined in |
attribute_udt_name Name of the attribute data type |
scope_catalog Applies to a feature not available in PostgreSQL |
scope_schema Applies to a feature not available in PostgreSQL |
scope_name Applies to a feature not available in PostgreSQL |
maximum_cardinality Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
dtd_identifier An identifier of the data type descriptor of the attribute, unique among the data type descriptors pertaining to the composite type. This is mainly useful for joining with other instances of such identifiers. (The specific format of the identifier is not defined and not guaranteed to remain the same in future versions.) |
is_derived_reference_attribute Applies to a feature not available in PostgreSQL |
See also under , a similarly structured view, for further information on some of the columns.
character_sets#
The view character_sets identifies the character sets available in the current database. Since PostgreSQL does not support multiple character sets within one database, this view only shows one, which is the database encoding.
Take note of how the following terms are used in the SQL standard:
character repertoire
An abstract collection of characters, for example UNICODE, UCS, or LATIN1. Not exposed as an SQL object, but visible in this view.
character encoding form
An encoding of some character repertoire. Most older character repertoires only use one encoding form, and so there are no separate names for them (e.g., LATIN2 is an encoding form applicable to the LATIN2 repertoire). But for example Unicode has the encoding forms UTF8, UTF16, etc. (not all supported by PostgreSQL). Encoding forms are not exposed as an SQL object, but are visible in this view.
character set
A named SQL object that identifies a character repertoire, a character encoding, and a default collation. A predefined character set would typically have the same name as an encoding form, but users could define other names. For example, the character set UTF8 would typically identify the character repertoire UCS, encoding form UTF8, and some default collation.
You can think of an “encoding” in PostgreSQL either as a character set or a character encoding form. They will have the same name, and there can only be one in one database.
Column Type Description |
|---|
character_set_catalog Character sets are currently not implemented as schema objects, so this column is null. |
character_set_schema Character sets are currently not implemented as schema objects, so this column is null. |
character_set_name Name of the character set, currently implemented as showing the name of the database encoding |
character_repertoire Character repertoire, showing |
form_of_use Character encoding form, same as the database encoding |
default_collate_catalog Name of the database containing the default collation (always the current database, if any collation is identified) |
default_collate_schema Name of the schema containing the default collation |
default_collate_name Name of the default collation. The default collation is identified as the collation that matches the |
check_constraint_routine_usage#
The view check_constraint_routine_usage identifies routines (functions and procedures) that are used by a check constraint. Only those routines are shown that are owned by a currently enabled role.
check_constraints#
The view check_constraints contains all check constraints, either defined on a table or on a domain, that are owned by a currently enabled role. (The owner of the table or domain is the owner of the constraint.)
The SQL standard considers not-null constraints to be check constraints with a CHECK (column_name IS NOT NULL) expression. So not-null constraints are also included here and don't have a separate view.
Column Type Description |
|---|
constraint_catalog Name of the database containing the constraint (always the current database) |
constraint_schema Name of the schema containing the constraint |
constraint_name Name of the constraint |
check_clause The check expression of the check constraint |
collations#
The view collations contains the collations available in the current database.
Column Type Description |
|---|
collation_catalog Name of the database containing the collation (always the current database) |
collation_schema Name of the schema containing the collation |
collation_name Name of the default collation |
pad_attribute Always |
collation_character_set_applicability#
The view collation_character_set_applicability identifies which character set the available collations are applicable to. In PostgreSQL, there is only one character set per database (see explanation in ), so this view does not provide much useful information.
Column Type Description |
|---|
collation_catalog Name of the database containing the collation (always the current database) |
collation_schema Name of the schema containing the collation |
collation_name Name of the default collation |
character_set_catalog Character sets are currently not implemented as schema objects, so this column is null |
character_set_schema Character sets are currently not implemented as schema objects, so this column is null |
character_set_name Name of the character set |
column_column_usage#
The view column_column_usage identifies all generated columns that depend on another base column in the same table. Only tables owned by a currently enabled role are included.
Column Type Description |
|---|
table_catalog Name of the database containing the table (always the current database) |
table_schema Name of the schema containing the table |
table_name Name of the table |
column_name Name of the base column that a generated column depends on |
dependent_column Name of the generated column |
column_domain_usage#
The view column_domain_usage identifies all columns (of a table or a view) that make use of some domain defined in the current database and owned by a currently enabled role.
Column Type Description |
|---|
domain_catalog Name of the database containing the domain (always the current database) |
domain_schema Name of the schema containing the domain |
domain_name Name of the domain |
table_catalog Name of the database containing the table (always the current database) |
table_schema Name of the schema containing the table |
table_name Name of the table |
column_name Name of the column |
column_options#
The view column_options contains all the options defined for foreign table columns in the current database. Only those foreign table columns are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
table_catalog Name of the database that contains the foreign table (always the current database) |
table_schema Name of the schema that contains the foreign table |
table_name Name of the foreign table |
column_name Name of the column |
option_name Name of an option |
option_value Value of the option |
column_privileges#
The view column_privileges identifies all privileges granted on columns to a currently enabled role or by a currently enabled role. There is one row for each combination of column, grantor, and grantee.
If a privilege has been granted on an entire table, it will show up in this view as a grant for each column, but only for the privilege types where column granularity is possible: SELECT, INSERT, UPDATE, REFERENCES.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
table_catalog Name of the database that contains the table that contains the column (always the current database) |
table_schema Name of the schema that contains the table that contains the column |
table_name Name of the table that contains the column |
column_name Name of the column |
privilege_type Type of the privilege: |
is_grantable
|
column_udt_usage#
The view column_udt_usage identifies all columns that use data types owned by a currently enabled role. Note that in PostgreSQL, built-in data types behave like user-defined types, so they are included here as well. See also for details.
Column Type Description |
|---|
udt_catalog Name of the database that the column data type (the underlying type of the domain, if applicable) is defined in (always the current database) |
udt_schema Name of the schema that the column data type (the underlying type of the domain, if applicable) is defined in |
udt_name Name of the column data type (the underlying type of the domain, if applicable) |
table_catalog Name of the database containing the table (always the current database) |
table_schema Name of the schema containing the table |
table_name Name of the table |
column_name Name of the column |
columns#
The view columns contains information about all table columns (or view columns) in the database. System columns (ctid, etc.) are not included. Only those columns are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
table_catalog Name of the database containing the table (always the current database) |
table_schema Name of the schema containing the table |
table_name Name of the table |
column_name Name of the column |
ordinal_position Ordinal position of the column within the table (count starts at 1) |
column_default Default expression of the column |
is_nullable
|
data_type Data type of the column, if it is a built-in type, or |
character_maximum_length If |
character_octet_length If |
numeric_precision If |
numeric_precision_radix If |
numeric_scale If |
datetime_precision If |
interval_type If |
interval_precision Applies to a feature not available in PostgreSQL (see |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Name of the database containing the collation of the column (always the current database), null if default or the data type of the column is not collatable |
collation_schema Name of the schema containing the collation of the column, null if default or the data type of the column is not collatable |
collation_name Name of the collation of the column, null if default or the data type of the column is not collatable |
domain_catalog If the column has a domain type, the name of the database that the domain is defined in (always the current database), else null. |
domain_schema If the column has a domain type, the name of the schema that the domain is defined in, else null. |
domain_name If the column has a domain type, the name of the domain, else null. |
udt_catalog Name of the database that the column data type (the underlying type of the domain, if applicable) is defined in (always the current database) |
udt_schema Name of the schema that the column data type (the underlying type of the domain, if applicable) is defined in |
udt_name Name of the column data type (the underlying type of the domain, if applicable) |
scope_catalog Applies to a feature not available in PostgreSQL |
scope_schema Applies to a feature not available in PostgreSQL |
scope_name Applies to a feature not available in PostgreSQL |
maximum_cardinality Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
dtd_identifier An identifier of the data type descriptor of the column, unique among the data type descriptors pertaining to the table. This is mainly useful for joining with other instances of such identifiers. (The specific format of the identifier is not defined and not guaranteed to remain the same in future versions.) |
is_self_referencing Applies to a feature not available in PostgreSQL |
is_identity If the column is an identity column, then |
identity_generation If the column is an identity column, then |
identity_start If the column is an identity column, then the start value of the internal sequence, else null. |
identity_increment If the column is an identity column, then the increment of the internal sequence, else null. |
identity_maximum If the column is an identity column, then the maximum value of the internal sequence, else null. |
identity_minimum If the column is an identity column, then the minimum value of the internal sequence, else null. |
identity_cycle If the column is an identity column, then |
is_generated If the column is a generated column, then |
generation_expression If the column is a generated column, then the generation expression, else null. |
is_updatable
|
Since data types can be defined in a variety of ways in SQL, and PostgreSQL contains additional ways to define data types, their representation in the information schema can be somewhat difficult. The column data_type is supposed to identify the underlying built-in type of the column. In PostgreSQL, this means that the type is defined in the system catalog schema pg_catalog. This column might be useful if the application can handle the well-known built-in types specially (for example, format the numeric types differently or use the data in the precision columns). The columns udt_name, udt_schema, and udt_catalog always identify the underlying data type of the column, even if the column is based on a domain. (Since PostgreSQL treats built-in types like user-defined types, built-in types appear here as well. This is an extension of the SQL standard.) These columns should be used if an application wants to process data differently according to the type, because in that case it wouldn't matter if the column is really based on a domain. If the column is based on a domain, the identity of the domain is stored in the columns domain_name, domain_schema, and domain_catalog. If you want to pair up columns with their associated data types and treat domains as separate types, you could write coalesce(domain_name, udt_name), etc.
constraint_column_usage#
The view constraint_column_usage identifies all columns in the current database that are used by some constraint. Only those columns are shown that are contained in a table owned by a currently enabled role. For a check constraint, this view identifies the columns that are used in the check expression. For a not-null constraint, this view identifies the column that the constraint is defined on. For a foreign key constraint, this view identifies the columns that the foreign key references. For a unique or primary key constraint, this view identifies the constrained columns.
Column Type Description |
|---|
table_catalog Name of the database that contains the table that contains the column that is used by some constraint (always the current database) |
table_schema Name of the schema that contains the table that contains the column that is used by some constraint |
table_name Name of the table that contains the column that is used by some constraint |
column_name Name of the column that is used by some constraint |
constraint_catalog Name of the database that contains the constraint (always the current database) |
constraint_schema Name of the schema that contains the constraint |
constraint_name Name of the constraint |
constraint_table_usage#
The view constraint_table_usage identifies all tables in the current database that are used by some constraint and are owned by a currently enabled role. (This is different from the view table_constraints, which identifies all table constraints along with the table they are defined on.) For a foreign key constraint, this view identifies the table that the foreign key references. For a unique or primary key constraint, this view simply identifies the table the constraint belongs to. Check constraints and not-null constraints are not included in this view.
Column Type Description |
|---|
table_catalog Name of the database that contains the table that is used by some constraint (always the current database) |
table_schema Name of the schema that contains the table that is used by some constraint |
table_name Name of the table that is used by some constraint |
constraint_catalog Name of the database that contains the constraint (always the current database) |
constraint_schema Name of the schema that contains the constraint |
constraint_name Name of the constraint |
data_type_privileges#
The view data_type_privileges identifies all data type descriptors that the current user has access to, by way of being the owner of the described object or having some privilege for it. A data type descriptor is generated whenever a data type is used in the definition of a table column, a domain, or a function (as parameter or return type) and stores some information about how the data type is used in that instance (for example, the declared maximum length, if applicable). Each data type descriptor is assigned an arbitrary identifier that is unique among the data type descriptor identifiers assigned for one object (table, domain, function). This view is probably not useful for applications, but it is used to define some other views in the information schema.
Column Type Description |
|---|
object_catalog Name of the database that contains the described object (always the current database) |
object_schema Name of the schema that contains the described object |
object_name Name of the described object |
object_type The type of the described object: one of |
dtd_identifier The identifier of the data type descriptor, which is unique among the data type descriptors for that same object. |
domain_constraints#
The view domain_constraints contains all constraints belonging to domains defined in the current database. Only those domains are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
constraint_catalog Name of the database that contains the constraint (always the current database) |
constraint_schema Name of the schema that contains the constraint |
constraint_name Name of the constraint |
domain_catalog Name of the database that contains the domain (always the current database) |
domain_schema Name of the schema that contains the domain |
domain_name Name of the domain |
is_deferrable
|
initially_deferred
|
domain_udt_usage#
The view domain_udt_usage identifies all domains that are based on data types owned by a currently enabled role. Note that in PostgreSQL, built-in data types behave like user-defined types, so they are included here as well.
Column Type Description |
|---|
udt_catalog Name of the database that the domain data type is defined in (always the current database) |
udt_schema Name of the schema that the domain data type is defined in |
udt_name Name of the domain data type |
domain_catalog Name of the database that contains the domain (always the current database) |
domain_schema Name of the schema that contains the domain |
domain_name Name of the domain |
domains#
The view domains contains all domains defined in the current database. Only those domains are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
domain_catalog Name of the database that contains the domain (always the current database) |
domain_schema Name of the schema that contains the domain |
domain_name Name of the domain |
data_type Data type of the domain, if it is a built-in type, or |
character_maximum_length If the domain has a character or bit string type, the declared maximum length; null for all other data types or if no maximum length was declared. |
character_octet_length If the domain has a character type, the maximum possible length in octets (bytes) of a datum; null for all other data types. The maximum octet length depends on the declared character maximum length (see above) and the server encoding. |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Name of the database containing the collation of the domain (always the current database), null if default or the data type of the domain is not collatable |
collation_schema Name of the schema containing the collation of the domain, null if default or the data type of the domain is not collatable |
collation_name Name of the collation of the domain, null if default or the data type of the domain is not collatable |
numeric_precision If the domain has a numeric type, this column contains the (declared or implicit) precision of the type for this domain. The precision indicates the number of significant digits. It can be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column |
numeric_precision_radix If the domain has a numeric type, this column indicates in which base the values in the columns |
numeric_scale If the domain has an exact numeric type, this column contains the (declared or implicit) scale of the type for this domain. The scale indicates the number of significant digits to the right of the decimal point. It can be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column |
datetime_precision If |
interval_type If |
interval_precision Applies to a feature not available in PostgreSQL (see |
domain_default Default expression of the domain |
udt_catalog Name of the database that the domain data type is defined in (always the current database) |
udt_schema Name of the schema that the domain data type is defined in |
udt_name Name of the domain data type |
scope_catalog Applies to a feature not available in PostgreSQL |
scope_schema Applies to a feature not available in PostgreSQL |
scope_name Applies to a feature not available in PostgreSQL |
maximum_cardinality Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
dtd_identifier An identifier of the data type descriptor of the domain, unique among the data type descriptors pertaining to the domain (which is trivial, because a domain only contains one data type descriptor). This is mainly useful for joining with other instances of such identifiers. (The specific format of the identifier is not defined and not guaranteed to remain the same in future versions.) |
element_types#
The view element_types contains the data type descriptors of the elements of arrays. When a table column, composite-type attribute, domain, function parameter, or function return value is defined to be of an array type, the respective information schema view only contains ARRAY in the column data_type. To obtain information on the element type of the array, you can join the respective view with this view. For example, to show the columns of a table with data types and array element types, if applicable, you could do:
SELECT c.column_name, c.data_type, e.data_type AS element_type
FROM information_schema.columns c LEFT JOIN information_schema.element_types e
ON ((c.table_catalog, c.table_schema, c.table_name, 'TABLE', c.dtd_identifier)
= (e.object_catalog, e.object_schema, e.object_name, e.object_type, e.collection_type_identifier))
WHERE c.table_schema = '...' AND c.table_name = '...'
ORDER BY c.ordinal_position;
This view only includes objects that the current user has access to, by way of being the owner or having some privilege.
Column Type Description |
|---|
object_catalog Name of the database that contains the object that uses the array being described (always the current database) |
object_schema Name of the schema that contains the object that uses the array being described |
object_name Name of the object that uses the array being described |
object_type The type of the object that uses the array being described: one of |
collection_type_identifier The identifier of the data type descriptor of the array being described. Use this to join with the |
data_type Data type of the array elements, if it is a built-in type, else |
character_maximum_length Always null, since this information is not applied to array element data types in PostgreSQL |
character_octet_length Always null, since this information is not applied to array element data types in PostgreSQL |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Name of the database containing the collation of the element type (always the current database), null if default or the data type of the element is not collatable |
collation_schema Name of the schema containing the collation of the element type, null if default or the data type of the element is not collatable |
collation_name Name of the collation of the element type, null if default or the data type of the element is not collatable |
numeric_precision Always null, since this information is not applied to array element data types in PostgreSQL |
numeric_precision_radix Always null, since this information is not applied to array element data types in PostgreSQL |
numeric_scale Always null, since this information is not applied to array element data types in PostgreSQL |
datetime_precision Always null, since this information is not applied to array element data types in PostgreSQL |
interval_type Always null, since this information is not applied to array element data types in PostgreSQL |
interval_precision Always null, since this information is not applied to array element data types in PostgreSQL |
udt_catalog Name of the database that the data type of the elements is defined in (always the current database) |
udt_schema Name of the schema that the data type of the elements is defined in |
udt_name Name of the data type of the elements |
scope_catalog Applies to a feature not available in PostgreSQL |
scope_schema Applies to a feature not available in PostgreSQL |
scope_name Applies to a feature not available in PostgreSQL |
maximum_cardinality Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
dtd_identifier An identifier of the data type descriptor of the element. This is currently not useful. |
enabled_roles#
The view enabled_roles identifies the currently “enabled roles”. The enabled roles are recursively defined as the current user together with all roles that have been granted to the enabled roles with automatic inheritance. In other words, these are all roles that the current user has direct or indirect, automatically inheriting membership in.
For permission checking, the set of “applicable roles” is applied, which can be broader than the set of enabled roles. So generally, it is better to use the view applicable_roles instead of this one; See for details on applicable_roles view.
Column Type Description |
|---|
role_name Name of a role |
foreign_data_wrapper_options#
The view foreign_data_wrapper_options contains all the options defined for foreign-data wrappers in the current database. Only those foreign-data wrappers are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_data_wrapper_catalog Name of the database that the foreign-data wrapper is defined in (always the current database) |
foreign_data_wrapper_name Name of the foreign-data wrapper |
option_name Name of an option |
option_value Value of the option |
foreign_data_wrappers#
The view foreign_data_wrappers contains all foreign-data wrappers defined in the current database. Only those foreign-data wrappers are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_data_wrapper_catalog Name of the database that contains the foreign-data wrapper (always the current database) |
foreign_data_wrapper_name Name of the foreign-data wrapper |
authorization_identifier Name of the owner of the foreign server |
library_name File name of the library that implementing this foreign-data wrapper |
foreign_data_wrapper_language Language used to implement this foreign-data wrapper |
foreign_server_options#
The view foreign_server_options contains all the options defined for foreign servers in the current database. Only those foreign servers are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_server_catalog Name of the database that the foreign server is defined in (always the current database) |
foreign_server_name Name of the foreign server |
option_name Name of an option |
option_value Value of the option |
foreign_servers#
The view foreign_servers contains all foreign servers defined in the current database. Only those foreign servers are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_server_catalog Name of the database that the foreign server is defined in (always the current database) |
foreign_server_name Name of the foreign server |
foreign_data_wrapper_catalog Name of the database that contains the foreign-data wrapper used by the foreign server (always the current database) |
foreign_data_wrapper_name Name of the foreign-data wrapper used by the foreign server |
foreign_server_type Foreign server type information, if specified upon creation |
foreign_server_version Foreign server version information, if specified upon creation |
authorization_identifier Name of the owner of the foreign server |
foreign_table_options#
The view foreign_table_options contains all the options defined for foreign tables in the current database. Only those foreign tables are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_table_catalog Name of the database that contains the foreign table (always the current database) |
foreign_table_schema Name of the schema that contains the foreign table |
foreign_table_name Name of the foreign table |
option_name Name of an option |
option_value Value of the option |
foreign_tables#
The view foreign_tables contains all foreign tables defined in the current database. Only those foreign tables are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
foreign_table_catalog Name of the database that the foreign table is defined in (always the current database) |
foreign_table_schema Name of the schema that contains the foreign table |
foreign_table_name Name of the foreign table |
foreign_server_catalog Name of the database that the foreign server is defined in (always the current database) |
foreign_server_name Name of the foreign server |
key_column_usage#
The view key_column_usage identifies all columns in the current database that are restricted by some unique, primary key, or foreign key constraint. Check constraints are not included in this view. Only those columns are shown that the current user has access to, by way of being the owner or having some privilege.
Column Type Description |
|---|
constraint_catalog Name of the database that contains the constraint (always the current database) |
constraint_schema Name of the schema that contains the constraint |
constraint_name Name of the constraint |
table_catalog Name of the database that contains the table that contains the column that is restricted by this constraint (always the current database) |
table_schema Name of the schema that contains the table that contains the column that is restricted by this constraint |
table_name Name of the table that contains the column that is restricted by this constraint |
column_name Name of the column that is restricted by this constraint |
ordinal_position Ordinal position of the column within the constraint key (count starts at 1) |
position_in_unique_constraint For a foreign-key constraint, ordinal position of the referenced column within its unique constraint (count starts at 1); otherwise null |
parameters#
The view parameters contains information about the parameters (arguments) of all functions in the current database. Only those functions are shown that the current user has access to (by way of being the owner or having some privilege).
referential_constraints#
The view referential_constraints contains all referential (foreign key) constraints in the current database. Only those constraints are shown for which the current user has write access to the referencing table (by way of being the owner or having some privilege other than SELECT).
Column Type Description |
|---|
constraint_catalog Name of the database containing the constraint (always the current database) |
constraint_schema Name of the schema containing the constraint |
constraint_name Name of the constraint |
unique_constraint_catalog Name of the database that contains the unique or primary key constraint that the foreign key constraint references (always the current database) |
unique_constraint_schema Name of the schema that contains the unique or primary key constraint that the foreign key constraint references |
unique_constraint_name Name of the unique or primary key constraint that the foreign key constraint references |
match_option Match option of the foreign key constraint: |
update_rule Update rule of the foreign key constraint: |
delete_rule Delete rule of the foreign key constraint: |
role_column_grants#
The view role_column_grants identifies all privileges granted on columns where the grantor or grantee is a currently enabled role. Further information can be found under column_privileges. The only effective difference between this view and column_privileges is that this view omits columns that have been made accessible to the current user by way of a grant to PUBLIC.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
table_catalog Name of the database that contains the table that contains the column (always the current database) |
table_schema Name of the schema that contains the table that contains the column |
table_name Name of the table that contains the column |
column_name Name of the column |
privilege_type Type of the privilege: |
is_grantable
|
role_routine_grants#
The view role_routine_grants identifies all privileges granted on functions where the grantor or grantee is a currently enabled role. Further information can be found under routine_privileges. The only effective difference between this view and routine_privileges is that this view omits functions that have been made accessible to the current user by way of a grant to PUBLIC.
role_table_grants#
The view role_table_grants identifies all privileges granted on tables or views where the grantor or grantee is a currently enabled role. Further information can be found under table_privileges. The only effective difference between this view and table_privileges is that this view omits tables that have been made accessible to the current user by way of a grant to PUBLIC.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
table_catalog Name of the database that contains the table (always the current database) |
table_schema Name of the schema that contains the table |
table_name Name of the table |
privilege_type Type of the privilege: |
is_grantable
|
with_hierarchy In the SQL standard, |
role_udt_grants#
The view role_udt_grants is intended to identify USAGE privileges granted on user-defined types where the grantor or grantee is a currently enabled role. Further information can be found under udt_privileges. The only effective difference between this view and udt_privileges is that this view omits objects that have been made accessible to the current user by way of a grant to PUBLIC. Since data types do not have real privileges in PostgreSQL, but only an implicit grant to PUBLIC, this view is empty.
Column Type Description |
|---|
grantor The name of the role that granted the privilege |
grantee The name of the role that the privilege was granted to |
udt_catalog Name of the database containing the type (always the current database) |
udt_schema Name of the schema containing the type |
udt_name Name of the type |
privilege_type Always |
is_grantable
|
role_usage_grants#
The view role_usage_grants identifies USAGE privileges granted on various kinds of objects where the grantor or grantee is a currently enabled role. Further information can be found under usage_privileges. The only effective difference between this view and usage_privileges is that this view omits objects that have been made accessible to the current user by way of a grant to PUBLIC.
Column Type Description |
|---|
grantor The name of the role that granted the privilege |
grantee The name of the role that the privilege was granted to |
object_catalog Name of the database containing the object (always the current database) |
object_schema Name of the schema containing the object, if applicable, else an empty string |
object_name Name of the object |
object_type
|
privilege_type Always |
is_grantable
|
routine_column_usage#
The view routine_column_usage identifies all columns that are used by a function or procedure, either in the SQL body or in parameter default expressions. (This only works for unquoted SQL bodies, not quoted bodies or functions in other languages.) A column is only included if its table is owned by a currently enabled role.
routine_privileges#
The view routine_privileges identifies all privileges granted on functions to a currently enabled role or by a currently enabled role. There is one row for each combination of function, grantor, and grantee.
routine_routine_usage#
The view routine_routine_usage identifies all functions or procedures that are used by another (or the same) function or procedure, either in the SQL body or in parameter default expressions. (This only works for unquoted SQL bodies, not quoted bodies or functions in other languages.) An entry is included here only if the used function is owned by a currently enabled role. (There is no such restriction on the using function.)
Note that the entries for both functions in the view refer to the “specific” name of the routine, even though the column names are used in a way that is inconsistent with other information schema views about routines. This is per SQL standard, although it is arguably a misdesign. See for more information about specific names.
Column Type Description |
|---|
specific_catalog Name of the database containing the using function (always the current database) |
specific_schema Name of the schema containing the using function |
specific_name The “specific name” of the using function. |
routine_catalog Name of the database that contains the function that is used by the first function (always the current database) |
routine_schema Name of the schema that contains the function that is used by the first function |
routine_name The “specific name” of the function that is used by the first function. |
routine_sequence_usage#
The view routine_sequence_usage identifies all sequences that are used by a function or procedure, either in the SQL body or in parameter default expressions. (This only works for unquoted SQL bodies, not quoted bodies or functions in other languages.) A sequence is only included if that sequence is owned by a currently enabled role.
routine_table_usage#
The view routine_table_usage is meant to identify all tables that are used by a function or procedure. This information is currently not tracked by PostgreSQL.
routines#
The view routines contains all functions and procedures in the current database. Only those functions and procedures are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
specific_catalog Name of the database containing the function (always the current database) |
specific_schema Name of the schema containing the function |
specific_name The “specific name” of the function. This is a name that uniquely identifies the function in the schema, even if the real name of the function is overloaded. The format of the specific name is not defined, it should only be used to compare it to other instances of specific routine names. |
routine_catalog Name of the database containing the function (always the current database) |
routine_schema Name of the schema containing the function |
routine_name Name of the function (might be duplicated in case of overloading) |
routine_type
|
module_catalog Applies to a feature not available in PostgreSQL |
module_schema Applies to a feature not available in PostgreSQL |
module_name Applies to a feature not available in PostgreSQL |
udt_catalog Applies to a feature not available in PostgreSQL |
udt_schema Applies to a feature not available in PostgreSQL |
udt_name Applies to a feature not available in PostgreSQL |
data_type Return data type of the function, if it is a built-in type, or |
character_maximum_length Always null, since this information is not applied to return data types in PostgreSQL |
character_octet_length Always null, since this information is not applied to return data types in PostgreSQL |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Always null, since this information is not applied to return data types in PostgreSQL |
collation_schema Always null, since this information is not applied to return data types in PostgreSQL |
collation_name Always null, since this information is not applied to return data types in PostgreSQL |
numeric_precision Always null, since this information is not applied to return data types in PostgreSQL |
numeric_precision_radix Always null, since this information is not applied to return data types in PostgreSQL |
numeric_scale Always null, since this information is not applied to return data types in PostgreSQL |
datetime_precision Always null, since this information is not applied to return data types in PostgreSQL |
interval_type Always null, since this information is not applied to return data types in PostgreSQL |
interval_precision Always null, since this information is not applied to return data types in PostgreSQL |
type_udt_catalog Name of the database that the return data type of the function is defined in (always the current database). Null for a procedure. |
type_udt_schema Name of the schema that the return data type of the function is defined in. Null for a procedure. |
type_udt_name Name of the return data type of the function. Null for a procedure. |
scope_catalog Applies to a feature not available in PostgreSQL |
scope_schema Applies to a feature not available in PostgreSQL |
scope_name Applies to a feature not available in PostgreSQL |
maximum_cardinality Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
dtd_identifier An identifier of the data type descriptor of the return data type of this function, unique among the data type descriptors pertaining to the function. This is mainly useful for joining with other instances of such identifiers. (The specific format of the identifier is not defined and not guaranteed to remain the same in future versions.) |
routine_body If the function is an SQL function, then |
routine_definition The source text of the function (null if the function is not owned by a currently enabled role). (According to the SQL standard, this column is only applicable if |
external_name If this function is a C function, then the external name (link symbol) of the function; else null. (This works out to be the same value that is shown in |
external_language The language the function is written in |
parameter_style Always |
is_deterministic If the function is declared immutable (called deterministic in the SQL standard), then |
sql_data_access Always |
is_null_call If the function automatically returns null if any of its arguments are null, then |
sql_path Applies to a feature not available in PostgreSQL |
schema_level_routine Always |
max_dynamic_result_sets Applies to a feature not available in PostgreSQL |
is_user_defined_cast Applies to a feature not available in PostgreSQL |
is_implicitly_invocable Applies to a feature not available in PostgreSQL |
security_type If the function runs with the privileges of the current user, then |
to_sql_specific_catalog Applies to a feature not available in PostgreSQL |
to_sql_specific_schema Applies to a feature not available in PostgreSQL |
to_sql_specific_name Applies to a feature not available in PostgreSQL |
as_locator Applies to a feature not available in PostgreSQL |
created Applies to a feature not available in PostgreSQL |
last_altered Applies to a feature not available in PostgreSQL |
new_savepoint_level Applies to a feature not available in PostgreSQL |
is_udt_dependent Currently always |
result_cast_from_data_type Applies to a feature not available in PostgreSQL |
result_cast_as_locator Applies to a feature not available in PostgreSQL |
result_cast_char_max_length Applies to a feature not available in PostgreSQL |
result_cast_char_octet_length Applies to a feature not available in PostgreSQL |
result_cast_char_set_catalog Applies to a feature not available in PostgreSQL |
result_cast_char_set_schema Applies to a feature not available in PostgreSQL |
result_cast_char_set_name Applies to a feature not available in PostgreSQL |
result_cast_collation_catalog Applies to a feature not available in PostgreSQL |
result_cast_collation_schema Applies to a feature not available in PostgreSQL |
result_cast_collation_name Applies to a feature not available in PostgreSQL |
result_cast_numeric_precision Applies to a feature not available in PostgreSQL |
result_cast_numeric_precision_radix Applies to a feature not available in PostgreSQL |
result_cast_numeric_scale Applies to a feature not available in PostgreSQL |
result_cast_datetime_precision Applies to a feature not available in PostgreSQL |
result_cast_interval_type Applies to a feature not available in PostgreSQL |
result_cast_interval_precision Applies to a feature not available in PostgreSQL |
result_cast_type_udt_catalog Applies to a feature not available in PostgreSQL |
result_cast_type_udt_schema Applies to a feature not available in PostgreSQL |
result_cast_type_udt_name Applies to a feature not available in PostgreSQL |
result_cast_scope_catalog Applies to a feature not available in PostgreSQL |
result_cast_scope_schema Applies to a feature not available in PostgreSQL |
result_cast_scope_name Applies to a feature not available in PostgreSQL |
result_cast_maximum_cardinality Applies to a feature not available in PostgreSQL |
result_cast_dtd_identifier Applies to a feature not available in PostgreSQL |
schemata#
The view schemata contains all schemas in the current database that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
catalog_name Name of the database that the schema is contained in (always the current database) |
schema_name Name of the schema |
schema_owner Name of the owner of the schema |
default_character_set_catalog Applies to a feature not available in PostgreSQL |
default_character_set_schema Applies to a feature not available in PostgreSQL |
default_character_set_name Applies to a feature not available in PostgreSQL |
sql_path Applies to a feature not available in PostgreSQL |
sequences#
The view sequences contains all sequences defined in the current database. Only those sequences are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
sequence_catalog Name of the database that contains the sequence (always the current database) |
sequence_schema Name of the schema that contains the sequence |
sequence_name Name of the sequence |
data_type The data type of the sequence. |
numeric_precision This column contains the (declared or implicit) precision of the sequence data type (see above). The precision indicates the number of significant digits. It can be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column |
numeric_precision_radix This column indicates in which base the values in the columns |
numeric_scale This column contains the (declared or implicit) scale of the sequence data type (see above). The scale indicates the number of significant digits to the right of the decimal point. It can be expressed in decimal (base 10) or binary (base 2) terms, as specified in the column |
start_value The start value of the sequence |
minimum_value The minimum value of the sequence |
maximum_value The maximum value of the sequence |
increment The increment of the sequence |
cycle_option
|
Note that in accordance with the SQL standard, the start, minimum, maximum, and increment values are returned as character strings.
sql_features#
The table sql_features contains information about which formal features defined in the SQL standard are supported by PostgreSQL. This is the same information that is presented in ???. There you can also find some additional background information.
Column Type Description |
|---|
feature_id Identifier string of the feature |
feature_name Descriptive name of the feature |
sub_feature_id Identifier string of the subfeature, or a zero-length string if not a subfeature |
sub_feature_name Descriptive name of the subfeature, or a zero-length string if not a subfeature |
is_supported
|
is_verified_by Always null, since the PostgreSQL development group does not perform formal testing of feature conformance |
comments Possibly a comment about the supported status of the feature |
sql_implementation_info#
The table sql_implementation_info contains information about various aspects that are left implementation-defined by the SQL standard. This information is primarily intended for use in the context of the ODBC interface; users of other interfaces will probably find this information to be of little use. For this reason, the individual implementation information items are not described here; you will find them in the description of the ODBC interface.
Column Type Description |
|---|
implementation_info_id Identifier string of the implementation information item |
implementation_info_name Descriptive name of the implementation information item |
integer_value Value of the implementation information item, or null if the value is contained in the column |
character_value Value of the implementation information item, or null if the value is contained in the column |
comments Possibly a comment pertaining to the implementation information item |
sql_parts#
The table sql_parts contains information about which of the several parts of the SQL standard are supported by PostgreSQL.
Column Type Description |
|---|
feature_id An identifier string containing the number of the part |
feature_name Descriptive name of the part |
is_supported
|
is_verified_by Always null, since the PostgreSQL development group does not perform formal testing of feature conformance |
comments Possibly a comment about the supported status of the part |
sql_sizing#
The table sql_sizing contains information about various size limits and maximum values in PostgreSQL. This information is primarily intended for use in the context of the ODBC interface; users of other interfaces will probably find this information to be of little use. For this reason, the individual sizing items are not described here; you will find them in the description of the ODBC interface.
Column Type Description |
|---|
sizing_id Identifier of the sizing item |
sizing_name Descriptive name of the sizing item |
supported_value Value of the sizing item, or 0 if the size is unlimited or cannot be determined, or null if the features for which the sizing item is applicable are not supported |
comments Possibly a comment pertaining to the sizing item |
table_constraints#
The view table_constraints contains all constraints belonging to tables that the current user owns or has some privilege other than SELECT on.
Column Type Description |
|---|
constraint_catalog Name of the database that contains the constraint (always the current database) |
constraint_schema Name of the schema that contains the constraint |
constraint_name Name of the constraint |
table_catalog Name of the database that contains the table (always the current database) |
table_schema Name of the schema that contains the table |
table_name Name of the table |
constraint_type Type of the constraint: |
is_deferrable
|
initially_deferred
|
enforced Applies to a feature not available in PostgreSQL (currently always |
nulls_distinct If the constraint is a unique constraint, then |
table_privileges#
The view table_privileges identifies all privileges granted on tables or views to a currently enabled role or by a currently enabled role. There is one row for each combination of table, grantor, and grantee.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
table_catalog Name of the database that contains the table (always the current database) |
table_schema Name of the schema that contains the table |
table_name Name of the table |
privilege_type Type of the privilege: |
is_grantable
|
with_hierarchy In the SQL standard, |
tables#
The view tables contains all tables and views defined in the current database. Only those tables and views are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
table_catalog Name of the database that contains the table (always the current database) |
table_schema Name of the schema that contains the table |
table_name Name of the table |
table_type Type of the table: |
self_referencing_column_name Applies to a feature not available in PostgreSQL |
reference_generation Applies to a feature not available in PostgreSQL |
user_defined_type_catalog If the table is a typed table, the name of the database that contains the underlying data type (always the current database), else null. |
user_defined_type_schema If the table is a typed table, the name of the schema that contains the underlying data type, else null. |
user_defined_type_name If the table is a typed table, the name of the underlying data type, else null. |
is_insertable_into
|
is_typed
|
commit_action Not yet implemented |
transforms#
The view transforms contains information about the transforms defined in the current database. More precisely, it contains a row for each function contained in a transform (the “from SQL” or “to SQL” function).
triggered_update_columns#
For triggers in the current database that specify a column list (like UPDATE OF column1, column2), the view triggered_update_columns identifies these columns. Triggers that do not specify a column list are not included in this view. Only those columns are shown that the current user owns or has some privilege other than SELECT on.
Column Type Description |
|---|
trigger_catalog Name of the database that contains the trigger (always the current database) |
trigger_schema Name of the schema that contains the trigger |
trigger_name Name of the trigger |
event_object_catalog Name of the database that contains the table that the trigger is defined on (always the current database) |
event_object_schema Name of the schema that contains the table that the trigger is defined on |
event_object_table Name of the table that the trigger is defined on |
event_object_column Name of the column that the trigger is defined on |
triggers#
The view triggers contains all triggers defined in the current database on tables and views that the current user owns or has some privilege other than SELECT on.
Column Type Description |
|---|
trigger_catalog Name of the database that contains the trigger (always the current database) |
trigger_schema Name of the schema that contains the trigger |
trigger_name Name of the trigger |
event_manipulation Event that fires the trigger ( |
event_object_catalog Name of the database that contains the table that the trigger is defined on (always the current database) |
event_object_schema Name of the schema that contains the table that the trigger is defined on |
event_object_table Name of the table that the trigger is defined on |
action_order Firing order among triggers on the same table having the same |
action_condition
|
action_statement Statement that is executed by the trigger (currently always |
action_orientation Identifies whether the trigger fires once for each processed row or once for each statement ( |
action_timing Time at which the trigger fires ( |
action_reference_old_table Name of the “old” transition table, or null if none |
action_reference_new_table Name of the “new” transition table, or null if none |
action_reference_old_row Applies to a feature not available in PostgreSQL |
action_reference_new_row Applies to a feature not available in PostgreSQL |
created Applies to a feature not available in PostgreSQL |
Triggers in PostgreSQL have two incompatibilities with the SQL standard that affect the representation in the information schema. First, trigger names are local to each table in PostgreSQL, rather than being independent schema objects. Therefore there can be duplicate trigger names defined in one schema, so long as they belong to different tables. (trigger_catalog and trigger_schema are really the values pertaining to the table that the trigger is defined on.) Second, triggers can be defined to fire on multiple events in PostgreSQL (e.g., ON INSERT OR UPDATE), whereas the SQL standard only allows one. If a trigger is defined to fire on multiple events, it is represented as multiple rows in the information schema, one for each type of event. As a consequence of these two issues, the primary key of the view triggers is really (trigger_catalog, trigger_schema, event_object_table, trigger_name, event_manipulation) instead of (trigger_catalog, trigger_schema, trigger_name), which is what the SQL standard specifies. Nonetheless, if you define your triggers in a manner that conforms with the SQL standard (trigger names unique in the schema and only one event type per trigger), this will not affect you.
[!NOTE] Prior to PostgreSQL 9.1, this view's columns action_timing, action_reference_old_table, action_reference_new_table, action_reference_old_row, and action_reference_new_row were named condition_timing, condition_reference_old_table, condition_reference_new_table, condition_reference_old_row, and condition_reference_new_row respectively. That was how they were named in the SQL:1999 standard. The new naming conforms to SQL:2003 and later.
udt_privileges#
The view udt_privileges identifies USAGE privileges granted on user-defined types to a currently enabled role or by a currently enabled role. There is one row for each combination of type, grantor, and grantee. This view shows only composite types (see under for why); see for domain privileges.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
udt_catalog Name of the database containing the type (always the current database) |
udt_schema Name of the schema containing the type |
udt_name Name of the type |
privilege_type Always |
is_grantable
|
usage_privileges#
The view usage_privileges identifies USAGE privileges granted on various kinds of objects to a currently enabled role or by a currently enabled role. In PostgreSQL, this currently applies to collations, domains, foreign-data wrappers, foreign servers, and sequences. There is one row for each combination of object, grantor, and grantee.
Since collations do not have real privileges in PostgreSQL, this view shows implicit non-grantable USAGE privileges granted by the owner to PUBLIC for all collations. The other object types, however, show real privileges.
In PostgreSQL, sequences also support SELECT and UPDATE privileges in addition to the USAGE privilege. These are nonstandard and therefore not visible in the information schema.
Column Type Description |
|---|
grantor Name of the role that granted the privilege |
grantee Name of the role that the privilege was granted to |
object_catalog Name of the database containing the object (always the current database) |
object_schema Name of the schema containing the object, if applicable, else an empty string |
object_name Name of the object |
object_type
|
privilege_type Always |
is_grantable
|
user_defined_types#
The view user_defined_types currently contains all composite types defined in the current database. Only those types are shown that the current user has access to (by way of being the owner or having some privilege).
SQL knows about two kinds of user-defined types: structured types (also known as composite types in PostgreSQL) and distinct types (not implemented in PostgreSQL). To be future-proof, use the column user_defined_type_category to differentiate between these. Other user-defined types such as base types and enums, which are PostgreSQL extensions, are not shown here. For domains, see instead.
Column Type Description |
|---|
user_defined_type_catalog Name of the database that contains the type (always the current database) |
user_defined_type_schema Name of the schema that contains the type |
user_defined_type_name Name of the type |
user_defined_type_category Currently always |
is_instantiable Applies to a feature not available in PostgreSQL |
is_final Applies to a feature not available in PostgreSQL |
ordering_form Applies to a feature not available in PostgreSQL |
ordering_category Applies to a feature not available in PostgreSQL |
ordering_routine_catalog Applies to a feature not available in PostgreSQL |
ordering_routine_schema Applies to a feature not available in PostgreSQL |
ordering_routine_name Applies to a feature not available in PostgreSQL |
reference_type Applies to a feature not available in PostgreSQL |
data_type Applies to a feature not available in PostgreSQL |
character_maximum_length Applies to a feature not available in PostgreSQL |
character_octet_length Applies to a feature not available in PostgreSQL |
character_set_catalog Applies to a feature not available in PostgreSQL |
character_set_schema Applies to a feature not available in PostgreSQL |
character_set_name Applies to a feature not available in PostgreSQL |
collation_catalog Applies to a feature not available in PostgreSQL |
collation_schema Applies to a feature not available in PostgreSQL |
collation_name Applies to a feature not available in PostgreSQL |
numeric_precision Applies to a feature not available in PostgreSQL |
numeric_precision_radix Applies to a feature not available in PostgreSQL |
numeric_scale Applies to a feature not available in PostgreSQL |
datetime_precision Applies to a feature not available in PostgreSQL |
interval_type Applies to a feature not available in PostgreSQL |
interval_precision Applies to a feature not available in PostgreSQL |
source_dtd_identifier Applies to a feature not available in PostgreSQL |
ref_dtd_identifier Applies to a feature not available in PostgreSQL |
user_mapping_options#
The view user_mapping_options contains all the options defined for user mappings in the current database. Only those user mappings are shown where the current user has access to the corresponding foreign server (by way of being the owner or having some privilege).
Column Type Description |
|---|
authorization_identifier Name of the user being mapped, or |
foreign_server_catalog Name of the database that the foreign server used by this mapping is defined in (always the current database) |
foreign_server_name Name of the foreign server used by this mapping |
option_name Name of an option |
option_value Value of the option. This column will show as null unless the current user is the user being mapped, or the mapping is for |
user_mappings#
The view user_mappings contains all user mappings defined in the current database. Only those user mappings are shown where the current user has access to the corresponding foreign server (by way of being the owner or having some privilege).
Column Type Description |
|---|
authorization_identifier Name of the user being mapped, or |
foreign_server_catalog Name of the database that the foreign server used by this mapping is defined in (always the current database) |
foreign_server_name Name of the foreign server used by this mapping |
view_column_usage#
The view view_column_usage identifies all columns that are used in the query expression of a view (the SELECT statement that defines the view). A column is only included if the table that contains the column is owned by a currently enabled role.
[!NOTE] Columns of system tables are not included. This should be fixed sometime.
Column Type Description |
|---|
view_catalog Name of the database that contains the view (always the current database) |
view_schema Name of the schema that contains the view |
view_name Name of the view |
table_catalog Name of the database that contains the table that contains the column that is used by the view (always the current database) |
table_schema Name of the schema that contains the table that contains the column that is used by the view |
table_name Name of the table that contains the column that is used by the view |
column_name Name of the column that is used by the view |
view_routine_usage#
The view view_routine_usage identifies all routines (functions and procedures) that are used in the query expression of a view (the SELECT statement that defines the view). A routine is only included if that routine is owned by a currently enabled role.
view_table_usage#
The view view_table_usage identifies all tables that are used in the query expression of a view (the SELECT statement that defines the view). A table is only included if that table is owned by a currently enabled role.
[!NOTE] System tables are not included. This should be fixed sometime.
Column Type Description |
|---|
view_catalog Name of the database that contains the view (always the current database) |
view_schema Name of the schema that contains the view |
view_name Name of the view |
table_catalog Name of the database that contains the table that is used by the view (always the current database) |
table_schema Name of the schema that contains the table that is used by the view |
table_name Name of the table that is used by the view |
views#
The view views contains all views defined in the current database. Only those views are shown that the current user has access to (by way of being the owner or having some privilege).
Column Type Description |
|---|
table_catalog Name of the database that contains the view (always the current database) |
table_schema Name of the schema that contains the view |
table_name Name of the view |
view_definition Query expression defining the view (null if the view is not owned by a currently enabled role) |
check_option
|
is_updatable
|
is_insertable_into
|
is_trigger_updatable
|
is_trigger_deletable
|
is_trigger_insertable_into
|