Join external condition bug/feature when you use a RC?

First I picked up on this bug/feature in an article in the blog of Armstrong ([http://learndiscoverer.blogspot.com/2008/05/using-case-to-solver-outer-join-issues.html])

It seems that when you use an OR condition in Disco as well as 10 g, it ignores the join on the table conditions...

I've included the two reports the SQL code to illustrate my point:

Here is the SQL code generated when I agree with the point of view, you will notice the outer join (i.e. "(+)" ")
SELECT O100288. UNIQUE_ID, O100291. UNIQUE_ID
OF ODSTHING. TABLE1: O100288, ODSTHING. O100291 FROM TABLE2
WHERE ((O100291. UNIQUE_ID = O100288. UNIQUE_ID (+)))
;

Here's what happens if I simply add that a condition is not null. Notice the outer join on the 'IS NOT NULL' which allows to do nothing
SELECT O100288. UNIQUE_ID, O100291. UNIQUE_ID
OF ODSTHING. TABLE1: O100288, ODSTHING. O100291 FROM TABLE2
WHERE ((O100291. UNIQUE_ID = O100288. UNIQUE_ID (+))) AND (O100288. UNIQUE_ID (+) IS NOT NULL)
;

This is what happens when I have AND the same condition with himself, he remains outside joined
SELECT O100288. UNIQUE_ID, O100291. UNIQUE_ID
OF ODSTHING. TABLE1: O100288, ODSTHING. O100291 FROM TABLE2
WHERE ((O100291. UNIQUE_ID = O100288. UNIQUE_ID (+))) AND (((O100288. UNIQUE_ID (+) IS NOT NULL AND O100288. UNIQUE_ID (+) IS NOT NULL)))
;+

Here's what happens if I have the same CONDITION with himself. MAGIC! The outer join disappears!
SELECT O100288. UNIQUE_ID, O100291. UNIQUE_ID
OF ODSTHING. TABLE1: O100288, ODSTHING. O100291 FROM TABLE2
WHERE ((O100291. UNIQUE_ID = O100288. UNIQUE_ID (+))) AND (((O100288. UNIQUE_ID IS NOT NULL OR O100288. UNIQUE_ID IS NOT NULL)))
;

Is it the way it is supposed to work? If it is then I don't see any trace of it in the documentation ([http://download.oracle.com/docs/html/B13915_04/conditions.htm])

Is it just a useful bug?

What people think about its use?

Published by: user4404031 on Sep 12, 2008 08:23

Hello

It is documented (http://download.oracle.com/docs/html/B13916_04/conditions.htm#sthref854) that the discoverer does not use outer joins with IN and OR conditions. But the implications of this are not stated. The documentation never tries to explain the underlying SQL.

Rod West

Tags: Business Intelligence

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