SQL SERVER – How to ALTER CONSTRAINT

After reading my earlier blog post SQL SERVER – Prevent Constraint to Allow NULL. I recently received question from user regarding how to alter the constraint.

No. We cannot alter the constraint, only thing we can do is drop and recreate it.

Here is the CREATE and DROP script.

CREATE DATABASE TestDB

GO

USE TestDB

GO

CREATE TABLE TestTable (ID INT, Col1 INT, Col2 INT)

GO

-- Create Constraint on Col1

ALTER TABLE TestTable ADD CONSTRAINT CK_TestTable_Col1

CHECK (Col1 > 0)

GO

-- Dropping Constraint on Col1

ALTER TABLE TestTable DROP CONSTRAINT CK_TestTable_Col1

GO

Read more: Journey to SQLAuthority

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