Re: how does NOT work?

From: "Nigel J(dot) Andrews" <nandrews(at)investsystems(dot)co(dot)uk>
To: tony <tony(at)animaproductions(dot)com>
Cc: postgres list <pgsql-general(at)postgresql(dot)org>
Subject: Re: how does NOT work?
Date: 2002-04-24 15:22:34
Message-ID: Pine.LNX.4.21.0204241622090.965-100000@ponder.fairway2k.co.uk
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On 24 Apr 2002, tony wrote:

> 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?

NULLs?

:)

--
Nigel J. Andrews
Director

---
Logictree Systems Limited
Computer Consultants

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