Delete Check Constraints

THIS TOPIC APPLIES TO:yesSQL Server (starting with 2008)yesAzure SQL DatabasenoAzure SQL Data Warehouse noParallel Data Warehouse

You can delete a check constraint in SQL Server 2017 by using SQL Server Management Studio or Transact-SQL. Deleting check constraints removes the limitations on data values that are accepted in the column or columns included in the constraint expression.

In This Topic

Before You Begin

Security

Permissions

Requires ALTER permission on the table.

Using SQL Server Management Studio

To delete a check constraint

  1. In Object Explorer, expand the table with the check constraint.

  2. Expand Constraints.

  3. Right-click the constraint and click Delete.

  4. In the Delete Object dialog box, click OK.

Using Transact-SQL

To delete a check constraint

  1. In Object Explorer, connect to an instance of Database Engine.

  2. On the Standard bar, click New Query.

  3. Copy and paste the following example into the query window and click Execute.

    ALTER TABLE dbo.DocExc   
    DROP CONSTRAINT CHK_ColumnD_DocExc;  
    GO  
    

    For more information, see ALTER TABLE (Transact-SQL).