Re: Failing query...

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Shaun <delius(at)progsoc(dot)uts(dot)edu(dot)au>
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: Failing query...
Date: 2000-08-19 21:34:25
Message-ID: 6992.966720865@sss.pgh.pa.us
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Shaun <delius(at)progsoc(dot)uts(dot)edu(dot)au> writes:
> SELECT a.auction_id, a.user_id, c.other_names,
> c.surname, c.email, a.reserve, a.close_time, a.short_desc,
> a.long_desc, a.start_time,
> (COALESCE((select MAX(bid) from bid where auction_id = a.auction_id
> group by auction_id), 0)) as max_bid
> FROM Auction a, Customer c
> WHERE a.user_id = c.user_id
> AND a.auction_id = 754;

Sub-selects inside COALESCE don't work :-(. This was just fixed about a
week ago --- it will be in 7.1. In the meantime you might try it the
other way round:

(select COALESCE(MAX(bid), 0) from bid where auction_id = a.auction_id)
as max_bid

regards, tom lane

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