# alex(at)meerkatsoft(dot)com / 2005-01-20 01:35:32 +1100:
> i have a unique index on a table over multiple columns. If now one of
> the records has a null value in one of the indexed columns i can insert
> the same record multiple times.
>
> Is this a problem within postgres or expected?
In SQL, NULL means "unknown value". How could you assert that two
NULLs are equal?
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