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.
Name of the database that the domain data type is defined in (always the current database)
Name of the schema that the domain data type is defined in
Name of the domain data type
Name of the database that contains the domain (always the current database)
Name of the schema that contains the domain
Name of the domain