You can enable or disable check constraints instead of deleting them. Use NOT NULL constraint to restrict the NULL values.Ĭheck constraints are not validated during the Delete statements. So NULL can be inserted without restriction. If you try to insert a value outside the check constraint value range then SQL engine throws an error stating that the insert statement conflicted with the CHECK constraint and the statement was terminated.Ī check constraint does not evaluate a NULL value. The conflict occurred in database "HR", table "dbo.Employee", column 'Salary'.Ī check constraint can be created with any logical Boolean that returns True or False based on logical operators.įor example, a boolean expression Salary > 2000 and Salary < 4000 specifies that the value in the Salary column must be more than 2000 and less than 4000.Ī boolean expression of check constraint can use multiple columns.Ī single column can have multiple check constraints.Ĭheck constraints reject values that evaluate to False. The INSERT statement conflicted with the CHECK constraint "CHK_Emp_Salary". Now, if you try to insert or update a record in the Employee table where Salary is not within the specified range, then it will raise the following error. SQL Server - GRANT/REVOKE Permissions to User.
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