--期初數據
DECLARE @stock TABLE(id int,num decimal(10,2))
INSERT @stock SELECT 1,100
UNION? ALL??? SELECT 3,500
UNION? ALL??? SELECT 4,800
--入庫數據
DECLARE @in TABLE(id int,num decimal(10,2))
INSERT @in SELECT 1,100
UNION? ALL SELECT 1,80
UNION? ALL SELECT 2,800
--出庫數據
DECLARE @out TABLE(id int,num decimal(10,2))
INSERT @out SELECT 2,100
UNION? ALL? SELECT 3,100
UNION? ALL? SELECT 3,200
--統計
SELECT id,
?stock_opening=SUM(stock_opening),
?stock_in=SUM(stock_in),
?stock_out=SUM(stock_out),
?stock_closing=SUM(stock_closing)
FROM(
?SELECT id,stock_opening=num,stock_in=0,stock_out=0,stock_closing=num
?FROM @stock
?UNION ALL
?SELECT id,stock_opening=0,stock_in=num,stock_out=0,stock_closing=num
?FROM @in
?UNION ALL
?SELECT id,stock_opening=0,stock_in=0,stock_out=num,stock_closing=-num
?FROM @out
)a GROUP BY id
/*--結果
id????????? stock_opening??? stock_in???? stock_out????? stock_closing
---------------- ----------------------- ----------------- -------------------- --------------------
1?????????? 100.00?????????? 180.00?????? .00????????? 280.00
2?????????? .00????????????? 800.00?????? 100.00?????? 700.00
3?????????? 500.00?????????? .00????????? 300.00?????? 200.00
4?????????? 800.00?????????? .00????????? .00????????? 800.00
--*/
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