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hello welcome to another video from SQL mos.com my name is Amit bunel and Iamp;#39;m going to be your host for this video in this video Iamp;#39;m going to talk about not in Clause not working now what do I mean by not in Clause not working in most of the forums that I visit I occasionally see users uh putting a question that they have written a a query a construct a SQL construct and they have used not in clause in that construct and when they run their query uh it does not throw an error but it always returns an empty result set now this is a really an interesting case because most of the users perceive this to be a as a logical bug but this is actually not a logical bug in almost all cases that I have seen uh not in Clause actually returns an empty result set because it is being used used against a uh against a subquery where the uh inner subquery returns one of the values as null so the target column for that particular table uh contains a null value and uh the outer query Compar