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Editorial Team
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Asked: 2026-06-11T20:06:13+00:00

Can someone explain me how below query will work.. i have table called employee

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Can someone explain me how below query will work.. i have table called employee

id FirstName LastName   Email            Groupid
1 Paula      Brown    pb@testdomain.org    12
2 James      Smith    jim@test.co.uk       12
3 James      Connor   jc@tes.co.uk         13


select * from employee where groupid=12 AND id NOT IN (1) OR id NOT IN (2)

how does this query works? Am trying to understand how AND clause works with OR. Any help would be appreciated…

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1 Answer

  1. Editorial Team

    AND has precedence over OR, so the condition is interpreted as

    (group=12 but id <> 1) OR (id <> 2)

    All three records match this condition:

    1 Paula      Brown    pb@testdomain.org    12 -- id <> 2
2 James      Smith    jim@test.co.uk       12 -- group=12 and id <> 1
3 James      Connor   jc@tes.co.uk         13 -- id <> 2

    If you are looking for a different order of evaluation, you can force it using parentheses.

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