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.
  
Table 37.19. domain_udt_usage Columns
| Name | Data Type | Description | 
|---|---|---|
| udt_catalog | sql_identifier | Name of the database that the domain data type is defined in (always the current database) | 
| udt_schema | sql_identifier | Name of the schema that the domain data type is defined in | 
| udt_name | sql_identifier | Name of the domain data type | 
| domain_catalog | sql_identifier | Name of the database that contains the domain (always the current database) | 
| domain_schema | sql_identifier | Name of the schema that contains the domain | 
| domain_name | sql_identifier | Name of the domain |