From: Tomasz Myrta <jasiek@klaster.net>
To: Shaun Watts <SWatts@computer-systems.com>
Cc: pgsql-sql@postgresql.org
Subject: Re: selecting problems
Date: Fri, 31 Oct 2003 20:53:12 +0100
Message-ID: <3FA2BDA8.60007@klaster.net> (raw)
In-Reply-To: <6A1C87CA83BA8C419B1262B3728B12D102D435@csiserv1.computer-systems.com>
References: <6A1C87CA83BA8C419B1262B3728B12D102D435@csiserv1.computer-systems.com>
Dnia 2003-10-31 20:19, Użytkownik Shaun Watts napisał:
> What I am trying to do is select all the rows out of the categories
> table (see below) and select the sum of j_amount out of the judgment
> table. Right now it is only returning the categories that are in the
> judgment table. I want it to return those fields with the amounts out
> of the judgment table, but also the all the other categories from the
> categories table with 0 as there amount. Does anyone have a
> suggestion.
>
> select ca_code,ca_desc,sum(j_amount) as sum_amt,ca_dis_cycle
> from categories LEFT OUTER JOIN judgment ON
> (j_category=ca_code)
> where j_case_no='45698'
> and j_party_no=1
> group by ca_code,ca_desc,ca_dis_cycle
>
> Thanks,
> Shaun
This left join won't work. Where clause changes your left join into
inner one.
select ca_code,ca_desc,sum(j_amount) as sum_amt,ca_dis_cycle
from categories LEFT OUTER JOIN judgment ON
(j_category=ca_code and j_case_no='45698' and j_party_no=1)
group by ca_code,ca_desc,ca_dis_cycle
or
select ca_code,ca_desc,sum(j_amount) as sum_amt,ca_dis_cycle
from categories LEFT OUTER JOIN judgment ON (j_category=ca_code)
where (j_case_no='45698' and j_party_no=1) or j_category is null
group by ca_code,ca_desc,ca_dis_cycle
Probably you also need to change your sum(j_amount) into:
sum(case when j_amount is null then 0 else j_amount end)
Regards,
Tomasz Myrta
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To: pgsql-sql@postgresql.org
Cc: jasiek@klaster.net, SWatts@computer-systems.com
Subject: Re: selecting problems
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