Using "SELECT *" vs "SELECT 1" or "SELECT 0" with EXISTS has no cost difference in SQL Server. More a matter of preference.

Nov 18, 2025 · Returns TRUE if a subquery contains any rows. The code samples in this article use the AdventureWorks2025 or AdventureWorksDW2025 sample database, which you can download from …

Oct 3, 2025 · Learn how to use the SQL EXISTS Boolean logic in IF statements, WHILE Loops and WHERE clauses with real world examples.

This article walks through different versions of T-SQL IF EXISTS statement for SQL database using various examples

In this tutorial, you will learn how to use the SQL Server EXISTS operator in the condition to test for the existence of rows in a subquery.

Aug 26, 2024 · If you don't know, EXISTS is a logical operator in SQL that is used to check if rows in a database exist. If the subquery produces one or more records, it returns TRUE. The NOT EXISTS …

This SQL Server tutorial explains how to use the EXISTS condition in SQL Server (Transact-SQL) with syntax and examples. It is used in combination with a subquery and is considered to be met if the …

The EXISTS operator is used to test for the existence of any record in a subquery. The EXISTS operator returns TRUE if the subquery returns one or more records.

Mar 21, 2022 · The SQL IF EXISTS tool is great to know for managing the flow of control of your SQL code. In this very brief tutorial, we’ll discuss everything you need to know about the IF EXISTS …

Jul 23, 2025 · The EXISTS operator is used to check whether the subquery returned any rows or not, if there are any rows returned then it will be true, whereas the IN operator matches with every record in …