In the database redesign process,an SQL tool that is useful for testing whether or not certain conditions or assumptions are valid is ________.
A)UPDATE
B)DROP TABLE
C)CREATE TRIGGER
D)NOT EXISTS

Question

Quizplus · Accepted Answer

The NOT EXISTS clause in SQL is useful for testing whether or not certain conditions or assumptions are valid. It returns true if a subquery returns no row, otherwise it returns false. This can be helpful in verifying that data exists or does not exist in specific conditions during the database redesign process. The other options listed, UPDATE, DROP TABLE, and CREATE TRIGGER, aren't specifically geared towards testing conditions or assumptions.

In the Database Redesign Process,an SQL Tool That Is Useful