Grzegorz Jaśkiewicz wrote:
> well, as a rule of thumb - unless you can't think of a default value of
> column - don't use nulls. So using nulls as default 'idunno' - is a bad
> practice, but everybody's opinion on that differ.
I don't understand this point of view. The concept of null was
introduced into the SQL vernacular by Codd and Date expressly to
represent unknown values.
In response to
pgsql-performance by date
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