When to Use a Subquery in SQL

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How do you know when to use a subquery?

Subqueries in SQL are a handy feature that let you use the results of one query as input into another query.

They can simplify your query and make it easier to maintain. But how do you know when to use a subquery instead of other methods, such as joins?

In this video, you’ll learn what a subquery is, when you should use a subquery, a simple example of a query, and transforming it to use a subquery to solve a problem.

You’ll also see when you should use a subquery or a join, as well as several other tips for working with SQL subqueries.

Timestamps:
00:00 What you’ll learn in this video
00:34 When you should use a subquery
01:41 A step-by-step example without a subquery
03:56 Using a subquery
05:06 Subquery vs join
06:43 Tips for working with subqueries