Re: Finding entries not in table..differnce?

Assuming that you don't have nulls in prodlang.prodlsku,
this should probably work, although I haven't tried it 
for real.

SELECT prodlang.prodlsku FROM prodlang 
WHERE NOT EXISTS 
(SELECT * FROM prodlang2WHERE prodlang2.prodlsku=prodlang.prodlsku);

If you do have nulls, the inner select probably needs
to be something like:
(SELECT * FROM prodlang2WHERE prodlang2.prodlsku=prodlang.prodlskuor (prodlang2.prodlsku is null and prodlang.prodlsku
isnull))
 

----- Original Message ----- 
From: "Zot O'Connor" <zot@zotconsulting.com>
To: "postgres sql" <pgsql-sql@hub.org>
Sent: Monday, July 10, 2000 5:29 PM
Subject: [SQL] Finding entries not in table..differnce?


> I need to write a quick function that tells me all of the entriles in
> table that are not in table2.
> 
> The tables are copies of each other, but 1 has been updated.  I know
> this is easy, but I am running on little sleep :)
> 
> I want to due something like
> 
> select prodlang.prodlsku from prodland,prodlang2 WHERE prodlang.prodlsku
> != prodlang2.prodlsku
> 
> But of course I would get every record, several times since at some
> point the sku does not equal another sku.
> 
> I tried !!= (NOT IN) but it did not like that at all, since sku is a
> char field.
> 
> I am running an older version of postgress on this server, I do not know
> if that is important.