Thread: Antw: [SQL] query with subquery abnormally slow?

>>> Oskar Liljeblad <osk@hem.passagen.se> 01.11.1999  19.47 Uhr >>>
>>I'm doing a SELECT query with a subquery on a table with 12K rows
>>but it is very slow (10 seconds+). The query looks like this:
>>
>>  select *
>>   from items
>>   where package in
>>      (select package
>>         from items
>>         where ...blah...
>>         group by package)
>> .....

I am sorry  if I am still sleeping and don't see the problem, but what is the difference between this querry and the
following:

select *  from items      where ...blah...

Gerhard

Hello ,,,
don't you think that you should use a multiple row function ( such as sum() 
or ... ) along with 'group by' clause in that query?

regards ,
omid omoomi

>From: "Gerhard Dieringer" <DieringG@eba-haus.de>
>To: <pgsql-sql@postgreSQL.org>
>Subject: Antw: [SQL] query with subquery abnormally slow?
>Date: Tue, 02 Nov 1999 07:45:31 +0100
>
>
>
> >>> Oskar Liljeblad <osk@hem.passagen.se> 01.11.1999  19.47 Uhr >>>
> >>I'm doing a SELECT query with a subquery on a table with 12K rows
> >>but it is very slow (10 seconds+). The query looks like this:
> >>
> >>  select *
> >>   from items
> >>   where package in
> >>      (select package
> >>         from items
> >>         where ...blah...
> >>         group by package)
> >> .....
>
>I am sorry  if I am still sleeping and don't see the problem, but what is 
>the difference between this querry and the following:
>
>select *
>    from items
>        where ...blah...
>
>Gerhard
>
>
>
>************
>
>

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