A check constraint is a condition that must be true for every row in a table. It is defined as part of the table definition using the CHECK keyword. You can specify one or more check constraints for ...

Sometimes we need to add ulterior constraints to the table we define. The ALTER TABLE statement enables us to do this. There are several types of constraints we can add. If we want to ensure that all ...

--Column u silme ALTER TABLE Teachers1 DROP COLUMN IdPost ADD CONSTRAINT HireDate_Before_1990 CHECK (HireDate <= '1990-01-01 ') ALTER TABLE Teachers1 ADD CONSTRAINT UNK_CODE UNIQUE (Code) ALTER TABLE ...

Sandra is a Tech enthusiast with a Journalism and Full-stack web development background. She specializes in web development and Cloud technology. For leisure, Sandra enjoys a good thriller, hugging ...