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

Apr 14, 2025 · What is SQL Subquery? 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. They are an essential tool when we need to ...

Feb 13, 2025 · What is subquery in SQL? A subquery is a SQL query nested inside a larger query. A subquery can be located in: - A SELECT clause - A FROM clause - A WHERE clause - A HAVING clause; The subquery can be nested inside a SELECT, INSERT, UPDATE, or DELETE statement or inside another subquery.

Mar 25, 2025 · Using the SQL subquery with the SELECT statement. The SELECT statement in SQL allows us to retrieve data from a database. We can use the SQL subquery with the SELECT statement to perform operations in SQL. Consider a table employees containing the given data: employee_id name department_id salary; 1: Alice: 101: 60000: 2: Bob: 102: 55000: 3 ...

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.

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.

In a subquery, the outer query's result depends on the result set of the inner subquery. That's why subqueries are also called nested queries. Here is how this code works: Suppose we want the details of customers who have placed an order. We can achieve that by using a subquery. FROM Customers . WHERE customer_id IN ( SELECT customer_id.

Summary: in this tutorial, you will learn about the SQL Server subquery and how to use the subquery for querying data. A subquery is a query nested inside another statement such as SELECT, INSERT, UPDATE, or DELETE. Let’s see the following example. Consider the orders and customers tables from the sample database.

Subqueries are enclosed within parentheses and can be used in various SQL statements such as SELECT, INSERT, UPDATE, and DELETE. Subqueries are used to retrieve data from one or more tables to be used as a condition in the main 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.