Re: Unique indices and nulls

>>>>> "Tom" == Tom Lane <tgl@sss.pgh.pa.us> writes:

    Tom> Tell you the truth, my advice is to reconsider the way you're
    Tom> using NULLs.  C.J. Date thinks NULLs are evil and best
    Tom> avoided ... your case may be an example of what he's driving
    Tom> at.

I have reconsidered...the NULLs have to stay, but the index is no
longer unique, it is only on the non-null columns, and is only being
used for select purposes.  Instead, I am enforcing the constraint via
a "before insert" trigger.  Except for loading the table, this table
will have virtually no inserts, so the trigger seems a reasonable way
to go.

roland
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Roland B. Roberts, PhD                             RL Enterprises
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