![]() More Examples of Nested SQL Queriesįirst of all, you can put a nested SELECT within the WHERE clause with comparison operators or the IN, NOT IN, ANY, or ALL operators. There are many different scenarios where SQL subqueries are very helpful. The proper term for this nested SELECT statement is a subquery. With the average GPA score returned by the inner query, the outer query can select the students who satisfy our filter condition (i.e. This is important for the comparison operator to work. a table with a single column and a single row). Our subquery here returns a single value (i.e. You’ll get a number (3.19) that you can use to solve the initial task – showing all information for students with a GPA above this average:īut can you solve this task in one step? You can with a nested query. Certainly, you can use a query to find out: However, you don’t know the average GPA score. Let’s say you want to find all students that have above-average GPAs. ![]() The database includes three tables: students, teachers, and classes. In this article, we’re going to work with data from a fictional high school. To make the concept clearer, let’s go through an example together. when you have a SELECT statement within the main SELECT. A nested SELECT is a query within a query, i.e. ![]()
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