Question

NOT EXISTS vs. NOT IN

Asked by: nmwis70

Hi,

I'm confused about differences or results in the following 2 queries.  One returns the desired results, the other does not  The logic that I am trying to accomplish is that I want a list of all the Emails in List1 that aren't in List2.

QUERY 1: (not working expectedly)

SELECT *
FROM List1
WHERE Email NOT IN (SELECT Email FROM List2)


QUERY 2:  (working as expected)

SELECT *
FROM List1
WHERE NOT EXISTS
(SELECT * FROM List2 WHERE List1.Email = List2.Email)


Am I missing something here?  Thanks.

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Asked On
2004-06-16 at 07:36:33ID21027446
Tags

exists

,

vs

Topic

Databases Miscellaneous

Participating Experts
5
Points
100
Comments
8

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Answers

 

Expert Comment

by: jmacmickingPosted on 2004-06-16 at 07:44:43ID: 11324970

Rank: Master

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Expert Comment

by: aidofspadesPosted on 2004-06-16 at 08:17:26ID: 11325365

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Accepted Solution

by: tw67jwPosted on 2004-06-16 at 08:28:50ID: 11325496

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Expert Comment

by: sonjaspersonPosted on 2004-06-16 at 08:35:17ID: 11325571

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Expert Comment

by: nmwis70Posted on 2004-06-16 at 08:38:20ID: 11325592

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Expert Comment

by: nmwis70Posted on 2004-06-16 at 08:57:58ID: 11325831

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Expert Comment

by: tw67jwPosted on 2004-06-16 at 11:03:44ID: 11327171

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Expert Comment

by: NerdsOfTechPosted on 2009-07-11 at 17:42:28ID: 24832818

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