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Thread: sub query

sub query

From
"Martin Kuria"
Date:
Hi I have this problem, when I try to run this query:

SELECT MAX(d), host_position FROM (SELECT host_position, 
COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e;

am getting and ERROR: Attribute e.host_position must be GROUPed or used in 
an aggregate function.

Please to advice what could be the problem and how can I rewrite it to work 
thanks in advance.

Kind regards
+-----------------------------------------------------+
| Martin W. Kuria (Mr.) martin.kuria@unon.org
+----------------------------------------------------+

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Re: sub query

From
Christoph Haller
Date:
> Hi I have this problem, when I try to run this query:
>
> SELECT MAX(d), host_position FROM (SELECT host_position,
> COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e;
>
> am getting and ERROR: Attribute e.host_position must be GROUPed or
used in
> an aggregate function.
>
> Please to advice what could be the problem and how can I rewrite it to
work
> thanks in advance.
>
As the error message says: e.host_position must be GROUPed

so (supposing you want a one row result showing the maximum count)

SELECT MAX(e.d), e.host_position FROM (SELECT host_position,
COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e
GROUP BY e.host_position ORDER BY 1 LIMIT 1;

should match your intentions.

Regards, Christoph

Re: sub query

From
Christoph Haller
Date:
>
> > Hi I have this problem, when I try to run this query:
> >
> > SELECT MAX(d), host_position FROM (SELECT host_position,
> > COUNT(host_position) as d FROM sss_host GROUP BY host_position) as
e;
> >
> > am getting and ERROR: Attribute e.host_position must be GROUPed or
> used in
> > an aggregate function.
> >
> > Please to advice what could be the problem and how can I rewrite it
to
> work
> > thanks in advance.
> >
> As the error message says: e.host_position must be GROUPed
>
> so (supposing you want a one row result showing the maximum count)
>
> SELECT MAX(e.d), e.host_position FROM (SELECT host_position,
> COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e
> GROUP BY e.host_position ORDER BY 1 LIMIT 1;
>
> should match your intentions.
>
Just thought about another (less complex) way:

SELECT COUNT(host_position), host_position FROM
sss_host GROUP BY host_position ORDER BY 1 DESC LIMIT 1;

Regards, Christoph

Re: sub query

From
"Martin Kuria"
Date:
Thanks Haller, the second one worked thanks a million be blessed

Regards

+-----------------------------------------------------+
| Martin W. Kuria (Mr.) martin.kuria@unon.org
+----------------------------------------------------+




>From: Christoph Haller <ch@rodos.fzk.de>
>To: pgsql-sql@postgresql.org
>CC: martinkuria@hotmail.com
>Subject: Re: [SQL] sub query
>Date: Wed, 17 Sep 2003 10:54:49 +0200
>
> >
> > > Hi I have this problem, when I try to run this query:
> > >
> > > SELECT MAX(d), host_position FROM (SELECT host_position,
> > > COUNT(host_position) as d FROM sss_host GROUP BY host_position) as
>e;
> > >
> > > am getting and ERROR: Attribute e.host_position must be GROUPed or
> > used in
> > > an aggregate function.
> > >
> > > Please to advice what could be the problem and how can I rewrite it
>to
> > work
> > > thanks in advance.
> > >
> > As the error message says: e.host_position must be GROUPed
> >
> > so (supposing you want a one row result showing the maximum count)
> >
> > SELECT MAX(e.d), e.host_position FROM (SELECT host_position,
> > COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e
> > GROUP BY e.host_position ORDER BY 1 LIMIT 1;
> >
> > should match your intentions.
> >
>Just thought about another (less complex) way:
>
>SELECT COUNT(host_position), host_position FROM
>sss_host GROUP BY host_position ORDER BY 1 DESC LIMIT 1;
>
>Regards, Christoph
>
>
>
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Re: sub query

From
Christoph Haller
Date:
The reason why the first one
SELECT MAX(e.d), e.host_position FROM (SELECT host_position,
COUNT(host_position) as d FROM sss_host GROUP BY host_position) as e
GROUP BY e.host_position ORDER BY 1 LIMIT 1;
did not work is because the query needs a
ORDER BY 1 DESC LIMIT 1 like the second one.
Mind the DESCending order.

Regards, Christoph

>
> Thanks Haller, the second one worked thanks a million be blessed
>
> > >
> > > > Hi I have this problem, when I try to run this query:
> > > >
> > > > SELECT MAX(d), host_position FROM (SELECT host_position,
> > > > COUNT(host_position) as d FROM sss_host GROUP BY host_position)
as
> >e;
> > > >
> > > > am getting and ERROR: Attribute e.host_position must be GROUPed
or
> > > used in
> > > > an aggregate function.
> > > >
> > > > Please to advice what could be the problem and how can I rewrite
it
> >to
> > > work
> > > > thanks in advance.
> > > >
> > > As the error message says: e.host_position must be GROUPed
> > >
> > > so (supposing you want a one row result showing the maximum count)

> > >
> > > SELECT MAX(e.d), e.host_position FROM (SELECT host_position,
> > > COUNT(host_position) as d FROM sss_host GROUP BY host_position) as
e
> > > GROUP BY e.host_position ORDER BY 1 LIMIT 1;
> > >
> > > should match your intentions.
> > >
> >Just thought about another (less complex) way:
> >
> >SELECT COUNT(host_position), host_position FROM
> >sss_host GROUP BY host_position ORDER BY 1 DESC LIMIT 1;
> >