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What is the difference between IS NULL and =NULL?


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IS NULL is how you check whether a value is actually NULL or not. You will get true/1 or false/0.

 

= NULL is normal comparison, except when you compare something with NULL you will simply get NULL as the result.

 

Try it:

SELECT 1 IS NULL;
SELECT 0 IS NULL;
SELECT NULL IS NULL;
SELECT 1 = NULL;
SELECT 0 = NULL;
SELECT NULL = NULL;
Edited by requinix
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