| 4.17.2 Table constraints |
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| A table constraint is either a unique constraint, a referential constraint or a table check constraint. A table constraint is described by a table constraint descriptor which is either a unique constraint descriptor, a referential constraint descriptor or a table check constraint descriptor. |
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| A check constraint is satisfied if and only if the specified <search condition> is not False for any or a given row of a table depending on how it was declared. |
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| A table check constraint is described by a table check constraint descriptor. In addition to the components of every table constraint descriptor, a table check constraint descriptor includes: The <search condition> . |
