----- Original Message -----
From: "Hoanui Morangie"
>
> I need NULL value, some of these columns are foreign keys.
introduce dummy tupples too, f.e. if u consider 0 as the NULL for numbers,
then have a dummy row with ID=0, so that the FK won't be violated and u'll
still have NULL semantics
>And using dummy values is not good practice anyway.
>
indeed, 3-valued logic (nulls) is often considered as a flaw and NULL usage
is not recommended.
And in your case u won't make use of any indexes for the queries, because
these null values can't be indexed
Marin
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