是的。
您将这union
两个表放在一起,并在结果集上运行总计。
;with cte as
(
select itemcode, purchasedate as tdate, purchaseqty as qty from purchases
union
select itemcode, salesdate, salesqty from sales
)
select
t1.*,
SUM(t2.qty)
from cte t1
left join cte t2
on t1.tdate>=t2.tdate
and t1.item = t2.item
group by t1.item, t1.pdate, t1.qty
为了在任何特定时间获得剩余的股票,同样的原则适用。
select p1.*,
case when (select SUM(abs(qty)) from sales) > SUM(p2.qty) then 0
else SUM(p2.qty) - (select SUM(abs(qty)) from sales) end as stockremaining
from purchases p1
left join purchases p2 on p1.item = p2.item
and p2.purchasedate <= p1.purchasedate
group by p1.purchasedate, p1.item, p1.qty
给
1 2012-01-01 10 0
1 2012-01-10 5 4