Re: wired behaviour

--- On Fri, 11/28/08, Lutz Steinborn <l(dot)steinborn(at)4c-ag(dot)de> wrote:

> From: Lutz Steinborn <l(dot)steinborn(at)4c-ag(dot)de>
> Subject: [SQL] wired behaviour
> To: pgsql-sql(at)postgresql(dot)org
> Date: Friday, November 28, 2008, 1:51 PM
> Hello,
>
> I have an problem understanding a simple query:
>
> For example I have the following:
> select count(*) from foo;
> gives me 1000
>
> select count(*) from foo where bar = 'Mr Spock';
> gives me 5
>
> select count(*) from foo where NOT bar = 'Mr
> Spock';
> gives me 857
>
> Why I'm not getting 955 for the last query ?
>
>
> Any idea ?
>
> Kindly regards
>
>
> Lutz
>
> --

Probably you have null values in bar column