OCTom (6/25/2010)
An unsupported technique? I have seen this used and have been encouraged to use this technique by an experienced consulted. I'll be sending him the link to this discussion. It behaves illogically (at least to me). I expected A,B,C to be the result. I haven't run it but find it disturbing that it would be inconsistent between versions, releases, whatever BY DESIGN!
If a consultant would ever try that on me, I'd fire him on the spot, and tell him what he can do with the bill for his hours worked.
Yes, it does work (*). Usually. Maybe even about 99.9% of the times. Is 0.1% chance of incorrect results acceptable for your user?
(*) Except, of course, in those cases where it does not work. Usually. Such as in this question.