某些资料库有不同的检查条件约束功能。
Some databases have different functionality for check constraints.
如需资料库如何使用检查条件约束的详细资讯，请参阅资料库文件。
Consult your database documentation for details about how your database works with check constraints.
检查条件约束可指定在资料表中为一或多个资料行所接受的资料值或格式。
A check constraint specifies the data values or formats that are acceptable in one or more columns in a table.
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