In the database redesign process,SQL tools that are useful for testing whether or not certain conditions or assumptions are valid are ________.
A)correlated subqueries
B)EXISTS
C)NOT EXISTS
D)B and C
E)A,B,and C

Question

Quizplus · Accepted Answer

Correlated subqueries, EXISTS, and NOT EXISTS are all SQL tools that can be used to test conditions or assumptions in a database. Correlated subqueries allow for row-by-row processing, while EXISTS and NOT EXISTS are used to check for the presence or absence of rows that meet certain criteria.

In the Database Redesign Process,SQL Tools That Are Useful for Testing