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Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly. You can read PostgreSQL as Postgres-XC except for version number, which is specific to each product.
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 Section 33.22 instead.
Table 33-55. user_defined_types Columns
| Name | Data Type | Description |
|---|---|---|
| user_defined_type_catalog | sql_identifier | Name of the database that contains the type (always the current database) |
| user_defined_type_schema | sql_identifier | Name of the schema that contains the type |
| user_defined_type_name | sql_identifier | Name of the type |
| user_defined_type_category | character_data | Currently always STRUCTURED |
| is_instantiable | yes_or_no | Applies to a feature not available in PostgreSQL |
| is_final | yes_or_no | Applies to a feature not available in PostgreSQL |
| ordering_form | character_data | Applies to a feature not available in PostgreSQL |
| ordering_category | character_data | Applies to a feature not available in PostgreSQL |
| ordering_routine_catalog | sql_identifier | Applies to a feature not available in PostgreSQL |
| ordering_routine_schema | sql_identifier | Applies to a feature not available in PostgreSQL |
| ordering_routine_name | sql_identifier | Applies to a feature not available in PostgreSQL |
| reference_type | character_data | Applies to a feature not available in PostgreSQL |
| data_type | character_data | Applies to a feature not available in PostgreSQL |
| character_maximum_length | cardinal_number | Applies to a feature not available in PostgreSQL |
| character_octet_length | cardinal_number | Applies to a feature not available 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 | Applies to a feature not available in PostgreSQL |
| numeric_precision_radix | cardinal_number | Applies to a feature not available in PostgreSQL |
| numeric_scale | cardinal_number | Applies to a feature not available in PostgreSQL |
| datetime_precision | cardinal_number | Applies to a feature not available in PostgreSQL |
| interval_type | character_data | Applies to a feature not available in PostgreSQL |
| interval_precision | cardinal_number | Applies to a feature not available in PostgreSQL |
| source_dtd_identifier | sql_identifier | Applies to a feature not available in PostgreSQL |
| ref_dtd_identifier | sql_identifier | Applies to a feature not available in PostgreSQL |