: emp_id (integer, should not be NULL and should be a primary key)Q : emp_name (text, should not be NULL)Q : age (integer, should have a check constraint to ensure the age is at least 18)Q : email ...
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 ...
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