select 语句中的子查询 POSTGRESQL

Question

我有两个不同的 tables（医疗和 Rx 数据）都包含支付日期和净付款。我想按医疗净支付总额和 Rx 净支付总额的年份和月份创建报告摘要。当我运行下面的 SQL 时，POSTGRESQL 说“子查询使用来自外部查询”的未分组列“a.date_paid”

我的想法是按第一个 table 分组并从第二个 table 子查询总净支付。 POSTGRESQL

select cast(EXTRACT(YEAR FROM a.date_paid) as text) || to_char(a.date_paid,'mm') as date_paid,
cast (sum(a.net_payment) as money) as Medical,a.member_ssn,
(Select sum(b.netpayment) from elan.rx_claims b where cast(EXTRACT(YEAR FROM a.date_paid) as text) || 
to_char(a.date_paid,'mm')=cast(EXTRACT(YEAR FROM b.date_paid) as text) || to_char(b.date_paid,'mm')
and a.member_ssn=b.member_ssn ) as RxPaid

from elan.staging_claims a
group by cast(EXTRACT(YEAR FROM a.date_paid) as text) || to_char(a.date_paid,'mm'),a.member_ssn

Answer 1

我自己解决了这个问题...

select  a.date_paid,a.member_ssn,memfirstname,memlastname ,cast (sum(a.net_payment) as money) ,

(Select sum(b.netpayment) from elan.rx_claims b 
 where cast(EXTRACT(YEAR FROM a.date_paid) as text) || to_char(a.date_paid,'mm')=cast(EXTRACT(YEAR FROM b.date_paid)as text) || to_char(b.date_paid,'mm')
 and a.member_ssn=b.member_ssn)

from elan.staging_claims a, elan.elig c
where a.member_ssn=c.employeessn
group by a.date_paid,a.member_ssn,memfirstname,memlastname
having sum(a.net_payment)>79999
order by 2 desc

select 语句中的子查询 POSTGRESQL

SubQuery within a select statement POSTGRESQL

postgresql

subquery