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From: Vernon Hamberg

I just ran a Google on 'exception join' and came across this link

http://www.freepatentsonline.com/7171398.html

"Outer and exception join to inner join normalization" is the title
on the patent - I recognized a name from my time as a contractor at
IBM in 2001 - and, lo and behold, it is one of the developers of SQE
- hmm - and related patents listed have another developer's name on
them. So this is a bunch of stuff from IBM - IBM makes a big deal of
having a whole bunch of intellectual property patents. Makes for some
interesting reading.

EXCEPTION JOIN, although a pretty common sense sort of thing, seems to be
limited primarily to DB2. In fact, it's not even part of the ANSI spec, so
technically it's a vendor-specific extension.

Which stinks, because it's really the best way to do what you want to do.
In "standard" SQL (such as Oracle) you do two SELECTs and then use the SET
operator EXCEPT (sort of the opposite of UNION) to perform the exception
work.

Yuk.

Joe


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