I am surprised to see that IS NULL and =NULL are yielding different results in a select query. What is difference between them? When to use what. I would be glad if you can explain me in detail.
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I am surprised to see that IS NULL and =NULL are yielding different results in a select query. What is difference between them? When to use what. I would be glad if you can explain me in detail.
= NULLis alwaysunknown(this is piece of 3 state logic), butWHEREclause treats it asfalseand drops from the result set. So forNULLyou should useIS NULLReasons are described here: Why does NULL = NULL evaluate to false in SQL server