I have a business rule which gives me rahter big challenges to "melt
in SQL":
At one "point in time" only one version may be active.
I have no specific solution, but I highly recommend Richard Snodgrass's
book, Developing Time-Oriented Database Applications in SQL, which
discusses this kind of situation, and many other similar ones. It's
out of print, but available from his homepage as a PDF:
http://www.cs.arizona.edu/~rts/
- John D. Burger
MITRE
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TIP 6: explain analyze is your friend
