In this tutorial, you'll learn about SQL subquery, a query nested within another query, to form flexible queries.

Nov 22, 2024 · A subquery is a query that is nested inside a SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery. The code samples in this article use the AdventureWorks2022 or AdventureWorksDW2022 sample database, which you can download from the Microsoft SQL Server Samples and Community Projects home page.

6 days ago · In SQL, a subquery can be defined as a query embedded within another query. It is often used in the WHERE, HAVING, or FROM clauses of a statement. Subqueries are commonly used with SELECT, UPDATE, INSERT, and DELETE statements to achieve complex filtering and data manipulation.

Aug 3, 2021 · In this section, we will illustrate how to write a subquery in SQL within the FROM clause. Instead of using a table or view name in the FROM clause, we can use a SQL subquery as a data source, noting that assigning an alias is required.

Feb 13, 2025 · What is subquery in SQL? A subquery is a SQL query nested inside a larger query. The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery. A subquery is usually added within the WHERE Clause of another SQL SELECT statement. You can use the comparison operators, such as >, <, or =.

Mar 25, 2025 · In this query: The subquery is executed first. It searches the departments table and returns the department_id of the ‘Sales’ department.; Next, the outer query is executed. It retrieves the department_id returned by the subquery and returns all employees whose department_id matches with the retrieved one.; This is how queries, including subqueries, are executed in SQL.

Nov 18, 2021 · In this article, I provide five subquery examples demonstrating how to use scalar, multirow, and correlated subqueries in the WHERE, FROM/JOIN, and SELECT clauses. A subquery, or nested query, is a query placed within another SQL query.

The objective of this SQL Server tutorial is to teach you how to use a SUBQUERY in a SQL statement to expand the scope of operation of the statement and to narrow its focus with respect to the output and get more specific output.

Jun 10, 2022 · Every data scientist needs to know their way around a SQL database, including subqueries. In this article, we'll cover the basics of SQL subqueries, their syntax, how they can be useful, and when and how to use them when querying a database.

In this tutorial, you will learn about the SQL Server subquery concept and how to use various subquery types to query data.