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how does NOT work? - Mailing list pgsql-general

From tony
Subject how does NOT work?
Date
Msg-id 1019661559.23158.30.camel@vaio
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Responses Re: how does NOT work?  ("Nigel J. Andrews" <nandrews@investsystems.co.uk>)
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Stange one

select count(*) from individu

count
18417

select count(*) from individu where type2 like 'a%'

count
12619

select count(*) from individu where type2 not like 'a%'

count
81

Clues?

Cheers

Tony Grant

--
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