Every subquery can be alternatively expressed by a join.

Question

Quizplus · Accepted Answer

Some subqueries, particularly those that involve aggregation or certain types of data manipulation, cannot be directly or efficiently expressed as joins. Joins are primarily used to combine rows from two or more tables based on a related column between them, whereas subqueries can be used for a wider range of operations, including those where the output of the subquery is used for comparison or in a SELECT clause.

Every Subquery Can Be Alternatively Expressed by a Join