On Tue, 4 Mar 2003, Ian Burrell wrote:
> I am doing a query where I need to sort by a column that may be NULL
> because it is coming from an OUTER JOIN. I noticed a difference between
> PostgreSQL and other databases about where NULLs show up. It seems that
> with Postgres, NULLs are sorted after other values. Other databases
> sort them before.
> Is there any standard on how sorting NULLs work? Is there a way to
IIRC, they're either considered greater than or less than non-NULL values,
but the decision is up to the implementation.
> change Postgres's behavior? Is there a way to replace the NULLs with
> empty strings?
Coalesce should work.
