On Tue, Mar 29, 2005 at 14:21:13 +0300,
> I have used coalesce function for null fields but coalesce is too slow.
> I need fast alternative for coalesce

It is unlikely that coalesce is your problem. People might be able to provide
some help if you provide EXPLAIN ANALYZE output and the actual query for your
slow query.

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TIP 9: the planner will ignore your desire to choose an index scan if your
      joining column's datatypes do not match

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