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Check constraints in SQL help keep data accurate by allowing only the right kind of information in a column. They make sure the data follows the rules, making databases easier to read and more secure.

Check constraints are supported in all of the major DBMS products, including DB2, Oracle, and SQL Server. But they are too-often ignored and not implemented in production databases. Properly defined, ...

CHECK-Einschränkungen sind ein leistungsstarkes Feature von SQL, mit dem Sie Datenintegritätsregeln für Ihre Tabellen erzwingen können. Sie können Ihnen dabei helfen, zu verhindern, dass ...

You can indeed change, with SQL 2000.<BR><BR>But I'm running into problems with the constraints when I attempt to do so.<BR><BR>I was hoping for a way to do this without having to drop and ...