With the exception of the NOT NULL constraint,constraints can be added to a table using the ADD clause of the ALTER TABLE command.

Question

With the exception of the NOT NULL constraint,constraints can be added to a table using the ADD clause of the ALTER TABLE command.​

Quizplus · Accepted Answer

This statement is true. Constraints like PRIMARY KEY, FOREIGN KEY, UNIQUE and CHECK can be added using the ADD clause of the ALTER TABLE command. However, the NOT NULL constraint needs to be added while creating the table itself and cannot be added later using the ALTER TABLE command.

With the Exception of the NOT NULL Constraint,constraints Can Be