RE: Matching Records

Bruce, good catch...

I looked at that multiple time but didn't catch it.

Still, seem wrong to have the text say "you can simulate a full outer join by using a left outer join
and a right exception join."

and not have a RIGHT EXCEPTION JOIN.

Oh well, already sent feedback to IBM on it since v5r4 version said the same. <grin>

Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Bruce Guetzkow
Sent: Wednesday, November 07, 2007 11:38 AM
To: RPG400-L Posting
Subject: RE: Matching Records

Charles:

<snip>
Note that the example shown at the above mentioned link is
incorrect! While the text says LEFT OUTER
+ RIGHT EXCEPTION, the example shows LEFT OUTER JOIN union
EXCEPTION JOIN.
EXCEPTION JOIN by itself
is the same as specifying LEFT EXCEPTION JOIN. So the example
would give you all the records from the left file with and
without matches on the right, plus another set of the records
from the left file that don't have matches in the right.
</snip>

Although your example is correct (and perhaps clearer), so is
the example.
They reversed the order of the files for the (left) EXCEPTION
JOIN (here is a snippet I created for future reference):

select
fld01
,fld02
from lib/file1 a <== FILE 1
left outer
join lib/file2 b <== FILE 2
on (a.fld001 = b.fld001
and a.fld002 = b.fld002)
where a.fld003 = 'A'

union

select
fld01
,fld02
from lib/file2 a <== FILE 2
exception
join lib/file1 b <== FILE 1
on (a.fld001 = b.fld001
and a.fld002 = b.fld002)
where a.fld003 = 'A'

group by fld01
order by fld01


You learn something new every day...

--Bruce Guetzkow



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