Using Where clause in between Inner Join Query - postgresql

Question

I am looking to fetch records and I have come through a scenario in which i have to include additional where clauses between the select query using inner join.
select stp.sales_person as "Sales_Person",
max(case when stp.jan_month is null then 0 else stp.jan_month end) as "January",
select sum(so.amount_total) from sale_order so inner join res_users ru on ru.id=so.user_id
where date(so.confirmation_date) > '2017-01-01' and date(so.confirmation_date) < '2017-01-30',
max(case when stp.feb_month is null then 0 else stp.feb_month end) as "February",
max(case when stp.march_month is null then 0 else stp.march_month end) as "March",
max(case when stp.dec_month is null then 0 else stp.dec_month end) as "December"
from sales_target_record stp
inner join res_partner rp on rp.name=stp.sales_person inner join res_users ru on ru.partner_id = rp.id inner join crm_team ct on ru.sale_team_id = ct.id
where ct.name = 'Direct Sales' group by stp.sales_person
I have to insert columns like i tried with sum but is not working as its a join query

Answer 1

You have a syntax issue in your query if this is truly SQL Server
select
stp.sales_person as Sales_Person,
max(case
when stp.jan_month is null
then 0
else stp.jan_month
end) as January,
--This needed parenthese since it's a subquery. Though, it's uncorrelated
( select sum(so.amount_total)
from sale_order so
inner join res_users ru on ru.id=so.user_id
where cast(so.confirmation_date as date) > '2017-01-01' and cast(so.confirmation_date as date) < '2017-01-30'
--here you need to add something like stp.someColumn = so.SomeColumn to correlate it to the outer query
) as SomeNewColumnUnCorrelated,
max(case
when stp.feb_month is null
then 0
else stp.feb_month
end) as February,
max(case
when stp.march_month is null
then 0
else stp.march_month
end) as March,
max(case
when stp.dec_month is null
then 0
else stp.dec_month
end) as December
from
sales_target_record stp
inner join
res_partner rp on
rp.name=stp.sales_person
inner join
res_users ru on
ru.partner_id = rp.id
where
ct.name = 'Direct Sales'
group by
stp.sales_person