Обсуждение: selecting problems

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
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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