RE: Matching Records

Adam,

A LEFT EXCEPTION JOIN union RIGHT EXCEPTION JOIN would give you only non-matching records.

A FULL OUTER JOIN gives you all matching and non-matching records from both files. From the link
given by Brian Johnson, a FULL OUTER JOIN = LEFT OUTER JOIN union RIGHT EXCEPTION JOIN.

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.


Lastly, in case you didn't know, you can select all fields from multiple files by simply doing:
select a.*, b.*
from file1 a, file2 b

actually you don't even need the correlation clause, this works too:
select file1.*, file2.*
from file1, file2


HTH,
Charles

-----Original Message-----
From: rpg400-l-bounces@xxxxxxxxxxxx
[mailto:rpg400-l-bounces@xxxxxxxxxxxx] On Behalf Of Adam Glauser
Sent: Wednesday, November 07, 2007 8:20 AM
To: rpg400-l@xxxxxxxxxxxx
Subject: Re: Matching Records

Booth Martin wrote:

lol... I looked at the request and said... " A simple 20 line
program, max, and somehow it'll be turned into a 500 line

beast that

no one can understand in under a 1/2 hour."

I don't know ... I think the SQL version would be relatively
straightforward. Maybe something like

SELECT file1.field1, file1.field2....,file1.fieldN,
file2.field1, file2.field2....,file2.fieldN

FROM file1 LEFT EXCEPTION JOIN file2
ON <matching fields>


UNION


SELECT file1.field1, file1.field2....,file1.fieldN,
file2.field1, file2.field2....,file2.fieldN

FROM file1 RIGHT EXCEPTION JOIN file2
ON <matching fields>


For me, that's way easier than learning how to write a
matching records program, but that's because I've known SQL
longer than RPG.
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