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

Each domain definition has a name that is unique within the entire database system. If a domain has been defined without an owner being entered, 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