Subquery in the SELECT clause # The following example uses a subquery in the SELECT clause to retrieve the first name, salary, and average salary of all employees: SELECT first_name, salary, ( SELECT ROUND (AVG (salary), 2) average_salary FROM employees ) FROM employees ORDER BY salary; Code language: SQL (Structured Query Language) (sql) Try it

Nov 22, 2024 · Look at an example of a subquery, which is a query that is nested in a SELECT, INSERT, UPDATE, or DELETE statement, or inside another subquery in SQL Server.

Jan 2, 2025 · In this article, We will learn about Subquery in a SELECT statement by understanding various examples and output in detail. A subquery (also known as a nested query or inner query) is a query placed inside another query. The subquery returns a result that is used by the outer query.

Oct 4, 2022 · This article showed you what you need to know about SQL subqueries and how to use them with the SELECT statement. However, subqueries are not limited to the SELECT statement only. You can use subqueries in all the CRUD operations of SQL – INSERT, SELECT, UPDATE, and DELETE.

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. They are an essential …

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.

subquery – the SELECT query within the main query which provides input to the main query for further processing. table_name – the table on which the main query or statement operates. SQL Server SUBQUERY Examples. Let us understand the different subquery types with the help of some examples.

Jun 26, 2023 · A subquery is a SELECT statement that is embedded in another SQL statement. A subquery can be a stand-alone SELECT statement (meaning it can be run independently of the outer query) or it can be a correlated SELECT statement (meaning it cannot be run independently of the outer query).

Jan 18, 2012 · I'd like to get sum of column1, sum of column2 and total sum. In Postgres I can do it this way: (notice the star) SELECT SUM(column1) AS a, SUM(column2) AS b. FROM table. But in Oracle I get an syntax error and have to use this: SELECT SUM(column1) AS a, SUM(column2) AS b. FROM table.

Oct 12, 2024 · In this tutorial, we’ll explore using subqueries in SELECT, WHERE, and FROM clauses and show how to handle them when they become repetitive (and redundant). All our examples are based on our University database schema. 2. Understanding Subqueries in SQL. A subquery, also known as a nested query, is a query inside another SQL query.