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Thread: Finding entries not in table..differnce?

Finding entries not in table..differnce?

From
"Zot O'Connor"
Date:
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.


-- 
Zot O'Connor

http://www.ZotConsulting.com
http://www.WhiteKnightHackers.com

Re: Finding entries not in table..differnce?

From
"Stephan Szabo"
Date:
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.

Re: Finding entries not in table..differnce?

From
Erol Oz
Date:
If I understand you exactly, you may use except:

select distinct * from prodlang
except
select distinct * from prodlang2

gives you the records which exist in prodlang and do not exist in
prodlang2. So you get all the records in prodlang which are newly
inserted  or updated.

regards
erol
Zot O'Connor wrote:
> 
> 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.
> 
> --
> Zot O'Connor
> 
> http://www.ZotConsulting.com
> http://www.WhiteKnightHackers.com