Often, a correlated subquery looks like a nested loop join. Select one:TrueFalse

Answer

True.

A correlated subquery indeed behaves similarly to a nested loop join. In a correlated subquery, the inner query executes repeatedly for each row processed by the outer query. This results in each invocation of the inner query potentially depending on the row of the outer query currently being processed.

This iterative process closely resembles the mechanics of a nested loop join, where for each row in the outer table, the database engine performs a lookup or a computation on the inner table. This allows correlated subqueries to filter or calculate values based on the data in the outer query's current row.

Thus, the statement reflects a fundamental similarity between the two methods of combining data.