pgsql，根据日期，单价计算收益

Question

有两个表：

表1-买入：

 

表2-卖出：

首先，买入的日期要比卖出低或者等于，然后再从最低价计算。

得到的表应该是：

只是其中一个公司的，实际情况会有多个公司多个股票，我要计算每卖出一笔的收益，收益是以最低单价开始计算，但是多了一个日期判定，即卖出日期前的最低单价开始计算，如果有剩余，则参与下一笔卖出计算。

Answer 1

select rq,nm,dm,mgs,mdj,myj,rq2,gs,dj,yj
from (select t.*,sum(gs) over(partition by nm,dm order by rq,dj,rq2) gs_s
from (
select a.*,row_number() over (partition by nm,dm,rq2,gs,dj,yj order by rq) rw 
from (select a.*,b.rq rq2,b.gs,b.dj,b.yj
from (select a1.*,row_number() over (partition by nm,dm order by rq) rw_1,
sum(mgs) over(partition by nm,dm order by rq) mgs_s 
from temp.temp_test_2 a1) a 
join temp.temp_test_1 b
on a.nm=b.nm and a.dm=b.dm
where a.rq>=b.rq) a 
) t 
where rw=1) t1
where gs_s-mgs_s <=0
union all
select rq,nm,dm,mgs,mdj,myj,rq2,gs-gs_s+mgs_s,dj,yj
from (select t.*,sum(gs) over(partition by nm,dm order by rq,dj,rq2) gs_s
from (
select a.*,row_number() over (partition by nm,dm,rq2,gs,dj,yj order by rq) rw 
from (select a.*,b.rq rq2,b.gs,b.dj,b.yj
from (select a1.*,row_number() over (partition by nm,dm order by rq) rw_1,
sum(mgs) over(partition by nm,dm order by rq) mgs_s 
from temp.temp_test_2 a1) a 
join temp.temp_test_1 b
on a.nm=b.nm and a.dm=b.dm
where a.rq>=b.rq) a 
) t 
where rw=1) t2
where gs_s-mgs_s >0 and gs>gs_s-mgs_s
union all 
select b.rq,b.nm,b.dm,b.mgs,b.mdj,b.myj,a.rq2,a.gs,a.dj,a.yj
from 
(select rw_1,rq2,case when gs>gs_s-mgs_s then gs_s-mgs_s else gs end gs,dj,yj
from (select t.*,sum(gs) over(partition by nm,dm order by rq,dj,rq2) gs_s
from (
select a.*,row_number() over (partition by nm,dm,rq2,gs,dj,yj order by rq) rw 
from (select a.*,b.rq rq2,b.gs,b.dj,b.yj
from (select a1.*,row_number() over (partition by nm,dm order by rq) rw_1,
sum(mgs) over(partition by nm,dm order by rq) mgs_s 
from temp.temp_test_2 a1) a 
join temp.temp_test_1 b
on a.nm=b.nm and a.dm=b.dm
where a.rq>=b.rq) a 
) t 
where rw=1) t3
where gs_s-mgs_s >0) a 
join (select a1.*,row_number() over (partition by nm,dm order by rq) rw_1,
sum(mgs) over(partition by nm,dm order by rq) mgs_s 
from temp.temp_test_2 a1) b 
on a.rw_1+1=b.rw_1
order by rq,dj