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Tip: T-SQL Performance--NOT IN vs NOT EXISTS

Learn the difference between using not in and not exists in T-SQL.


by Hannes Du Preez
Jul 22, 2019
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Avoid using NOT IN whilst comparing nullable columns. Use NOT EXISTS instead.

When NOT IN is used in a query, SQL Server compares each result to null (even if no rows are returned). NOT EXISTS does not perform a comparison with nulls.

 

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