SQL查詢找到如下總

Question

我有表結構：

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

我想+，讓每個stockno的實際數量平衡 -

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

但上面我得到總購買數量&銷售數量用下面的查詢：

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

，我想獲得電子商務的實際收盤數量紀錄股票。

Answer 1

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

Answer 2

使用的情況下的總和

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

Answer 3

另一選項（只是爲了好玩）內部到CONCAT（）的OP和數量

例

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

退貨

STOCKNO Ttl 
12345 -15.00 
123456 9.00 

Answer 4

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