Re: Please some help on a join question with sum

On Sat, 2003-04-19 at 19:52, Oliver Elphick wrote:

> SELECT aa.id,
> aa.seqno,
> aa.price + (
> SELECT SUM(bb.price)
> FROM bb
> WHERE bb.id = aa.id AND bb.seqno = aa.seqno
> ) AS price
> FROM aa;

If there aren't any matching records in bb, this won't work because the
sub-select will produce null, so it should actually be:

SELECT aa.id,
aa.seqno,
aa.price + COALESCE(
(SELECT SUM(bb.price)
FROM bb
WHERE bb.id = aa.id AND bb.seqno = aa.seqno),
0) AS price
FROM aa;

--
Oliver Elphick Oliver(dot)Elphick(at)lfix(dot)co(dot)uk
Isle of Wight, UK http://www.lfix.co.uk/oliver
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