Question

If the value of the EXISTS operator is ____________________, then the rows meeting the condition are displayed.​

A) True
B) Null
C) False
D) Unknown

Answer 1

The EXISTS operator in SQL returns True if the subquery linked to it returns any rows, which causes the main query to display the rows meeting the condition.

Step-by-step explanation:

If the value of the EXISTS operator is True, then the rows meeting the condition are displayed. The EXISTS operator is used in SQL to determine whether a subquery returns any rows. If the subquery does return at least one row, the EXISTS operator will evaluate to True. When this happens, the main query which contains the EXISTS condition will process the corresponding row(s). On the other hand, if the subquery returns no rows, the value of the EXISTS operator is False, and the row(s) in the main query are not processed regarding that condition.