Mastering SQL Server NOT EXISTS: A Comprehensive Guide (Free Download) The NOT EXISTS clause in SQL Server is a powerful tool for writing sophisticated queries that check for the absence of data. It's ...

This document outlines performance on using NOT IN versus NOT EXISTS clauses, where the compared field is NULLABLE or not NULLABLE.

The EXISTS condition is an operator whose right operand is a subquery. The result of an EXISTS condition is true if the subquery resolves to at least one row. The result of a NOT EXISTS condition is ...