
How to write subqueries in SQL - SQL Shack
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.
SQL Subquery - SQL Tutorial
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. FROM . table1. INNER JOIN table2 ON join_condition. WHERE . filter_condition; Code language: SQL (Structured Query Language) (sql)
SQL | Subquery - GeeksforGeeks
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 ...
Subqueries (SQL Server) - SQL Server | Microsoft Learn
Nov 22, 2024 · For example, if you assume each sales person only covers one sales territory, and you want to find the customers located in the territory covered by Linda Mitchell, you can write a statement with a subquery introduced with the simple = comparison operator.
SQL Subqueries - w3resource
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.
5 SQL Subquery Examples - LearnSQL.com
Nov 18, 2021 · Here are 5 SQL subquery examples demonstrating how to use scalar, multirow, and correlated subqueries in the WHERE, FROM, JOIN, and SELECT clauses.
Nested Queries in SQL - GeeksforGeeks
Apr 11, 2025 · Nested queries, also known as subqueries, are an essential tool in SQL for performing complex data retrieval tasks. They allow us to embed one query within another, enabling us to filter, aggregate, and perform sophisticated calculations.
SQL Server SUBQUERY with Examples - SQL Server Tutorial
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.
SQL Subquery (With Examples) - Programiz
In SQL, a SELECT statement may contain another SQL statement, known as a subquery or nested query. FROM Customers. WHERE age= ( -- subquery SELECT MAX(age) FROM CUSTOMERS. Here, the query is divided into two parts: SELECT column FROM table . Here, FROM Customers. WHERE age = ( SELECT MIN(age) FROM Customers.
How to Use the SQL Subquery: A Detailed Guide | Codecademy
Mar 25, 2025 · A SQL subquery, otherwise known as a nested SQL query, is a query within another query that helps filter, transform, or aggregate data before passing the results to the main query. We can use subqueries in SELECT , INSERT , UPDATE , and DELETE statements as well as WHERE , FROM , and HAVING clauses.