From: Tony Capobianco <tony.capobianco1@gmail.com>
To: David Johnston <polobo@yahoo.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: pivot query with count
Date: Sat, 13 Apr 2013 18:05:32 -0400
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Thank you very much for your response. However, I'm unclear what you want
me to substitute for sum(...)?
select '1' as "num_ads", sum(...)
from
(select a.userid from
user_event_stg2 a, user_region b
where a.userid = b.userid
and b.region_code = 1000
and a.messagetype = 'impression'
group by a.userid having count(a.userid) = 1)
group by num_ads;
I was able to eliminate that sub-select per your recommendation. That
makes things a bit easier.
Thanks.
On Fri, Apr 12, 2013 at 11:29 PM, David Johnston <polobo@yahoo.com> wrote:
> My prior comment simply answers your question. You likely can rewrite
> your
> query so that a separate grouping layer is not needed (or rather the group
> by would exist in the main query and you minimize the case/sub-select
> column
> queries and use aggregates and case instead).
>
> David J.
>
>
>
>
> --
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To: pgsql-sql@postgresql.org
Cc: tony.capobianco1@gmail.com, polobo@yahoo.com
Subject: Re: pivot query with count
In-Reply-To: <CABx31i4E52vtWjCwf-qQGbNC2vxE+xFPfhsBKBiFbTTOsp7xPQ@mail.gmail.com>
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