| From: | Stephan Szabo <sszabo(at)megazone23(dot)bigpanda(dot)com> |
|---|---|
| To: | cnliou(at)eurosport(dot)com |
| Cc: | pgsql-sql(at)postgresql(dot)org |
| Subject: | Re: SubQuery |
| Date: | 2001-10-04 01:24:03 |
| Message-ID: | Pine.BSF.4.21.0110031818200.53481-100000@megazone23.bigpanda.com |
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| Lists: | pgsql-sql |
On Thu, 4 Oct 2001 cnliou(at)eurosport(dot)com wrote:
> What mistake have I made?
>
> database1=# UPDATE mytable SET
> NextNumber=NextNumber+1
> database1-# WHERE id='ID1' AND EffectiveDate=
> database1-# (SELECT MAX(s2.EffectiveDate) FROM
> mytable s2
> database1(# WHERE s2.id=id AND
> s2.EffectiveDate<=CURRENT_DATE);
> UPDATE 0
I think you may need to disambiguate the s2.id=id
in the subquery to s2.id=mytable.id since both
have ids and it's probably assuming that means
s2.id=s2.id.
After changing that I get an UPDATE 1.
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