SQL Query查找Total

Question

我的表结构如下：

STOCKNO  QTY    OP
 12345   1.00   +
 12345   25.00  -
 12345   1.00   -
 12345   10.00  +
 123456  10.00  +
 123456  1.00   -

我想通过+， -

得到每个stockno的实际数量余额

+ (i.e. Purchase Qty)
- (i.e. Sales Qty)

但是对于上面我得到的总购买数量＆amp;使用以下查询销售数量：

 SELECT STOCKNO, SUM(QTY) as QTY, OP
 FROM DT
 GROUP BY STOCKNO, OP

我希望获得每只股票的实际收盘数量。

Answer 1

SELECT STOCKNO,
       SUM(case when OP = '-' then -QTY else QTY end) as BALANCE
FROM DT 
GROUP BY STOCKNO

Answer 2

在总和

中使用案例

select STOCKNO, sum(case when OP = '+' then 1 else -1 end * QTY) as StockLevel
from DT
group by STOCKNO

Answer 3

另一个选项（只是为了好玩）是concat（）OP和Qty

示例

Select STOCKNO
      ,Ttl = sum(convert(decimal(10,2),concat(OP,QTY)))
 from YourTable
 Group By STOCKNO

<强>返回

STOCKNO Ttl
12345   -15.00
123456  9.00

Answer 4

select STOCKNO,OP, sum(QTY) OVER(PARTITION BY STOCKNO,OP) as StockLevel
from DT