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  3. March 2009

Re: SQL Union Join?


Most likely the sql engine is converting the subselect to an exception
join, you'll need to do analects on it to determine what's going on.


Michael Schutte
Admin Professional



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midrange-l-bounces@xxxxxxxxxxxx wrote on 03/26/2009 11:02:56 AM:

Thanks Michael...that works too. Anyone know what's more efficient - an
exception join or a subselect? Probably depends, eh?

On Thu, Mar 26, 2009 at 10:07 AM, <Michael_Schutte@xxxxxxxxxxxx> wrote:


SELECT a.SKU, a.Name, a.Category
FROM TABLEA a
EXCEPTION JOIN TABLEB b
ON a.SKU = b.SKU
And a.Category = b.category


Michael Schutte
Admin Professional



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Michael Ryan
<michaelrtr@gmail
.com>
To
Sent by: Midrange Systems Technical
midrange-l-bounce Discussion
s@xxxxxxxxxxxx <midrange-l@xxxxxxxxxxxx>

cc

03/26/2009 09:59
Subject
AM Re: SQL Union Join?


Please respond to
Midrange Systems
Technical
Discussion
<midrange-l@midra
nge.com>






Thanks Alan...I did this, and it looks like it's working:

SELECT a.SKU, a.Name, a.Category
FROM TABLEA a, TABLEB b WHERE a.SKU = b.SKU And
a.Category not in (select b.category from TABLEB b where a.sku_number =
b.sku_number)

Folks, does this make sense? How can I improve on this?

On Thu, Mar 26, 2009 at 9:44 AM, Alan Shore <AlanShore@xxxxxxxx> wrote:

How about the following
select b.col1, b.col2, b.col3 from tableb b where not exists
(select * from tablea a where
a.col3 = b.col3)
or something similar
This is untested so I may have got something wrong


Alan Shore
Programmer/Analyst, Distribution
E:AShore@xxxxxxxxxxx <E%3AAShore@xxxxxxxxxxx> <E%
3AAShore@xxxxxxxxxxx<E%253AAShore@xxxxxxxxxxx>

P:(631) 200-5019
C:(631) 880-8640
"If you're going through Hell, keep going" - Winston Churchill

midrange-l-bounces@xxxxxxxxxxxx wrote on 03/26/2009 09:30:52 AM:

If I have two tables (TABLEA, TABLEB) that have the same format,
and I
want
to retrieve all the rows where a combination of two columns don't
match,
would that be a union join? If so, how is that specified? Here's
what I
have:

TABLEA and TABLE have the format of SKU, name and category. A SKU
could
exist in multiple categories.

TABLEA
123, NAME1, 1001
456, NAME2, 1002
123, NAME1, 1002
789, NAME3, 1004

TABLEB
001, SOMETHING, 1002
123, NAME1, 1003
456, NAME2, 1002
123, NAME1, 1002

I want to retrieve 123, NAME1, 1003 because that's the one that has
a
different category. I don't want to retrieve SKU 456, 789, or 001.
Hmmm...maybe I need to match on SKU with a subselect for that SKU
not
having
that category?

Thanks!
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