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hong  
#1 Posted : Saturday, August 23, 2014 11:14:42 AM(UTC)
hong

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Groups: AcademicCoachingSchool, admin, Administration, BookSeller, CatholicSchool, CoachingAdult, CoachingProfessional, CoachingSports, ExtraCurriculumCoaching, IndependentSchool, Moderator, MusicTeacher, PrivateSchool, PublicSchool, SelectiveSchool, tutor
Joined: 11/23/2008(UTC)
Posts: 522

In SQL query, the NOT IN list should not include NULL. Otherwise you won't find anything not in the list. If you believe that the following query should return some records but it didn't, check whether there is any NULL value in the list.

Code:
select * from myTable where myColumn not in (select anotherColumn from anotherTable)
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