Database Analyst Interview Question:

Tell us what are the different types of subqueries?

Submitted by: Muhammad

There are two types of subqueries: correlated and uncorrelated.

An uncorrelated subquery is a independent query whose output is substituted into the main query. A correlated subquery, on the other hand, uses values from the outer query and therefore depends on the outer query. Such a subquery executes repeatedly, once for each row that is selected by the outer query.
Submitted by: Muhammad