Message-ID: <3A4B0DE2.A93C02AD@anpe.fr>
Date: Thu, 28 Dec 2000 10:54:43 +0100
From: patrick.jacquot@anpe.fr
Organization: anpe
MIME-Version: 1.0
To: pgsql-sql@postgresql.org
Subject: Re: Query Help
References: <5.0.2.1.2.20001227111807.074dd2d0@pop.mindspring.com>
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"Brian C. Doyle" wrote:

> What do I have to do a query where information in table1 is not in table2
>
> I am looking for something like
>
> Select table1.firstname where table1.firstname is not in table2.firstname
> and table2.date='yesterday'
>
> I tried
> Select table1.firstname where table1.firstname != table2.firstname and
> table2.date='yesterday'
>
> and that did not work just listed everyone....

imho the most natrural way for what you need seems to be :

select  whatyouwant from table1 where not exists
    select * from table2 where table2.firstname = table1.firstname and
table2.date='yesterday';

hoping that helps
P. Jacquot