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The view routines contains 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).
Table 32-24. routines Columns
| Name | Data Type | Description |
|---|---|---|
| specific_catalog | sql_identifier | Name of the database containing the function (always the current database) |
| specific_schema | sql_identifier | Name of the schema containing the function |
| specific_name | sql_identifier | 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 | sql_identifier | Name of the database containing the function (always the current database) |
| routine_schema | sql_identifier | Name of the schema containing the function |
| routine_name | sql_identifier | Name of the function (may be duplicated in case of overloading) |
| routine_type | character_data | Always FUNCTION (In the future there might be other types of routines.) |
| module_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| module_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| module_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| udt_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| udt_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| udt_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| data_type | character_data | Return data type of the function, if it is a built-in type, or ARRAY if it is some array (in that case, see the view element_types), else USER-DEFINED (in that case, the type is identified in type_udt_name and associated columns). |
| character_maximum_length | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| character_octet_length | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| character_set_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| character_set_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| character_set_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| collation_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| collation_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| collation_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| numeric_precision | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| numeric_precision_radix | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| numeric_scale | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| datetime_precision | cardinal_number | Always null, since this information is not applied to return data types in PostgreSQL |
| interval_type | character_data | Always null, since this information is not applied to return data types in PostgreSQL |
| interval_precision | character_data | Always null, since this information is not applied to return data types in PostgreSQL |
| type_udt_catalog | sql_identifier | Name of the database that the return data type of the function is defined in (always the current database) |
| type_udt_schema | sql_identifier | Name of the schema that the return data type of the function is defined in |
| type_udt_name | sql_identifier | Name of the return data type of the function |
| scope_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| scope_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| scope_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| maximum_cardinality | cardinal_number | Always null, because arrays always have unlimited maximum cardinality in PostgreSQL |
| dtd_identifier | sql_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 | character_data | If the function is an SQL function, then SQL, else EXTERNAL. |
| routine_definition | character_data | The source text of the function (null if the current user is not the owner of the function). (According to the SQL standard, this column is only applicable if routine_body is SQL, but in PostgreSQL it will contain whatever source text was specified when the function was created.) |
| external_name | character_data | 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 routine_definition.) |
| external_language | character_data | The language the function is written in |
| parameter_style | character_data | Always GENERAL (The SQL standard defines other parameter styles, which are not available in PostgreSQL.) |
| is_deterministic | character_data | If the function is declared immutable (called deterministic in the SQL standard), then YES, else NO. (You cannot query the other volatility levels available in PostgreSQL through the information schema.) |
| sql_data_access | character_data | Always MODIFIES, meaning that the function possibly modifies SQL data. This information is not useful for PostgreSQL. |
| is_null_call | character_data | If the function automatically returns null if any of its arguments are null, then YES, else NO. |
| sql_path | character_data | Applies to a feature not available in PostgreSQL |
| schema_level_routine | character_data | Always YES (The opposite would be a method of a user-defined type, which is a feature not available in PostgreSQL.) |
| max_dynamic_result_sets | cardinal_number | Applies to a feature not available in PostgreSQL |
| is_user_defined_cast | character_data | Applies to a feature not available in PostgreSQL |
| is_implicitly_invocable | character_data | Applies to a feature not available in PostgreSQL |
| security_type | character_data | If the function runs with the privileges of the current user, then INVOKER, if the function runs with the privileges of the user who defined it, then DEFINER. |
| to_sql_specific_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| to_sql_specific_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| to_sql_specific_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| as_locator | character_data | Applies to a feature not available in PostgreSQL |