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T-SQL: CHECK Constraints - TechNet Articles - United States (English) - TechNet Wiki
Module 5: Implementing Data Integrity. Overview Types of Data Integrity Enforcing Data Integrity Defining Constraints Types of Constraints Disabling Constraints. - ppt download
Commonly used SQL Server Constraints: FOREIGN KEY, CHECK and DEFAULT
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sql server - SSMS Check Constraint Does not Allow Update of Table with valid data - Stack Overflow