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Your SQL server may ignore CHECK constraints for several reasons: 1. **Existing Data Violation**: If there’s already data in the table that violates the CHECK constraint, the constraint might be ignored for that existing data. 2. **Deferring Constraints**: In some databases, constraints can be deferred, meaning they are checked at a later time, such as at the end of a transaction. 3. **Incorrect Syntax**: Ensure that the CHECK constraint is defined correctly in your table schema. 4. **Database Compatibility**: Some SQL Server configurations or compatibility levels may not enforce CHECK constraints properly. 5. **Data Type Issues**: If the data types involved in the CHECK constraint are incompatible, it may not be enforced. To troubleshoot, check for existing data violations, ensure proper syntax, and verify the database settings regarding constraint enforcement.
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