I've scoured the docs and found nothing. My situation is this:
How do I set up a constraint on a table, where I want a unique combination
of fields, only when one of them equals a certain value?
For instance:
Col1 Col2
---- ------
N 1 <= OK
N 0 <= OK
N 0 <= OK
N 1 <= NOT OK
It obviously cannot be done through basic column constraints, since it is OK
to have multiple N,0 combinations.
My sense is that there would have to be a trigger to affect a query lookup
of the N,1 combination prior to insert. However, I desparately want to
avoid that for performance reasons.
Any help is appreciated.
Thanks
David Curiel
Bioinformatics Software Engineer
Pioneer Hi-Bred Int'l
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Author: Curiel, David
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