Understanding Subqueries
SELECT statements are SQL queries. All the SELECT statements we have seen thus far are simple queries: single statements retrieving data from individual database tables.
Note
Query Any SQL statement. However, the term is usually used to refer to SELECT statements.
SQL also enables you to create subqueries: queries that are embedded into other queries. Why would you want to do this? The best way to understand this concept is to look at a couple of examples.
Get Sams Teach Yourself SQL in 10 Minutes now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.
