Web Reference: For this, we can use NOT EXISTS, which negates the logic of the EXISTS operator. Therefore, the NOT EXISTS operator returns true if the underlying subquery returns no record. The SQL NOT EXISTS operator is used to check if a subquery returns no result. It is often used in combination with a correlated subquery, which is a subquery that depends on values from the outer query. Jul 23, 2025 · In this article, we are going to compare NOT IN and NOT EXISTS operators. We are going to discuss their syntax, working, and differences between them. We will also see examples related to them. Before directly moving to the NOT IN and NOT EXISTS, we have to create two tables in our database.
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