COUNT, DISTINCT, and NULLs in SQL Server
NULLs are interesting values. While they fill an important need in the database, it's not always intuitive how different SQL Server statements and functions handle them.
This week we examine how COUNTs and DISTINCTs interact with NULLs...and how they may not always be doing what you expect with them.
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Related blog post with more examples:
https://bertwagner.com/2019/02/19/cou...
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