From: | Achilleus Mantzios <achill(at)matrix(dot)gatewaynet(dot)com> |
---|---|
To: | Joachim Trinkwitz <jtr(at)uni-bonn(dot)de> |
Cc: | pgsql-sql(at)postgresql(dot)org |
Subject: | Re: Aggregates not allowed in WHERE clause? |
Date: | 2002-06-19 08:18:13 |
Message-ID: | Pine.LNX.4.44.0206191115510.7173-100000@matrix.gatewaynet.com |
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Thread: | |
Lists: | pgsql-sql |
On 19 Jun 2002, Joachim Trinkwitz wrote:
> Hi all,
>
> I have a table (lv) with a field "semester" and I'm trying to fish out all
> rows which have a value corresponding to a max() value of another
> table's (lf_sem) "semester" field. The intention is to keep a value
> with the current term in lf_sem so I can get all rows which concern
> this term.
>
> Example tables:
>
> lv
> ==
> semester | kvvnr
> ---------+------
> 2001ss | 4185
> 2001ss | 4203
> 2002ws | 4163
> 2002ws | 4190
>
> lf_sem
> ======
> semester
> --------
> 2001ws
> 2002ss
> 2002ws
>
> At first I tried this query:
>
> SELECT kvvnr
> FROM lv, lf_sem
> WHERE lv.semester = max(lf_sem.semester);
>
> This yields the message: 'Aggregates not allowed in WHERE clause'.
>
> Next I tried this one:
>
> SELECT kvvnr, max(lf_sem.semester) AS akt_semester
> FROM lv, lf_sem
> WHERE lv.semester = akt_semester;
>
> Now I got: 'Attribute 'akt_semester' not found'
>
> Is there another way to get what I want?
SELECT lv.kvvnr,lv.semester from lv where lv.semester = (select
max(semester) from lf_sem);
>
> Clueless,
> joachim
>
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--
Achilleus Mantzios
S/W Engineer
IT dept
Dynacom Tankers Mngmt
tel: +30-10-8981112
fax: +30-10-8981877
email: achill(at)matrix(dot)gatewaynet(dot)com
mantzios(at)softlab(dot)ece(dot)ntua(dot)gr
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