Can you replace or update a SQL constraint?

Question

I have written the following constraint for a column I\'ve called \'grade\':

CONSTRAINT gradeRule CHECK grade IN (‘easy’, ‘moderate’, ‘difficult’),
         


        

Answer 1

Drop the constraint, and then add the replacement constraint. You can't update a constraint in SQL Server at least.

ALTER TABLE SomeTable DROP CONSTRAINT gradeRule

In addition, you'll need to update the table data before adding the new constraint, so that it meets the new constraint.