A doubly nested set of NOT EXISTS SELECT statements is ________.
A)a famous pattern in SQL
B)regularly used
C)rarely used to nonexistent in the real world
D)Both A and B are correct

Question

Quizplus · Accepted Answer

Doubly nested NOT EXISTS SELECT statements are a famous pattern in SQL and are regularly used, especially in complex queries where one needs to check for the absence of certain records in relation to others. This pattern is useful in various scenarios, such as data validation, integrity checks, or complex condition matching, making both A and B correct.

A Doubly Nested Set of NOT EXISTS SELECT Statements Is