| Description | string | A domain constraint is a constraint that is specified for a domain. It is applied to all columns that are based on that domain, and to all values cast to that domain. A domain constraint is described by a domain constraint descriptor. In addition to the components of every constraint descriptor a domain constraint descriptor includes:
- The <search condition>.
A domain constraint is satisfied by SQL-data if and only if, for any table T that has a column named C based on that domain, the specified <search condition>, with each occurrence of VALUE replaced by C, is not False for any row of T. A domain constraint is satisfied by the result of a <cast specification> if and only if the specified <search condition>, with each occurrence of VALUE replaced by that result, is not False. |