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You can use domain definitions to define domains for table columns.

Each domain name is unique within the entire database system. If no owner was specified when the domain was created, the database system searches for the domain in the catalog parts in the following order:

  1. Catalog part of the current database user

  2. Catalog part of the database administrator who created the current database user

  3. Catalog part of the database system administrator

More Information

SQL Reference Manual, Domain Name

SQL Tutorial, Domains