Apr 14, 2025 · 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 .

Summary: In this tutorial, you’ll learn how to use SQL subqueries to form flexible queries for retrieving data from the database. A subquery is an SQL query nested inside another query. The query that contains a subquery is known as an outer query. To write a subquery, you need to have a deep understanding of the SELECT statement: select_list.

Feb 13, 2025 · 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 =.

Nov 22, 2024 · In this example, a subquery is used as a column expression named MaxUnitPrice in a SELECT statement. SELECT Ord.SalesOrderID, Ord.OrderDate, (SELECT MAX(OrdDet.UnitPrice) FROM Sales.SalesOrderDetail AS OrdDet. WHERE Ord.SalesOrderID = OrdDet.SalesOrderID) AS MaxUnitPrice. FROM Sales.SalesOrderHeader AS Ord;

Learn how to use subqueries in SQL to perform complex queries and enhance your database operations. Understand different types of subqueries with practical examples. Unlock the potential of SQL subqueries.

Mar 25, 2025 · We can use subqueries in SELECT, INSERT, UPDATE, and DELETE statements as well as WHERE, FROM, and HAVING clauses. Subqueries allow users to break complex queries into smaller, more manageable parts. This makes it easier to retrieve and manipulate data in a structured way.

What is SUBQUERY in SQL Server? A SUBQUERY is a SQL query within a SQL statement. A subquery can be part of a SELECT, INSERT, UPDATE or DELETE statement and is itself always a SELECT query. It is also possible for a subquery to have another subquery within it.

SQL subqueries are queries inside another query.

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.

Jan 16, 2025 · SQL subqueries are a powerful tool in database management, allowing for more complex and efficient data retrieval. This guide will walk you through the fundamentals of SQL subqueries, offering insights into their practical applications and advanced techniques.