如何查詢MSSQL行結合

Question

SELECT 
    PO.ITEM_NO, 
    PO_NO, 
    PO.DESCRIPT, 
    PO.REM1, 
    QTY 
FROM PODSCRP PO ,PRODUCT P 
WHERE P.ITEM_NO=PO.ITEM_NO AND PO.PO_NO ='PO170010' 

我希望得到的結果：

if REM1=1 this will FOC1_QTY, 
    REM1=2 FOC2_QTY, 
    REM1=NULL is SALE_QTY 
    and if not include REM1 VALUE 1 or 2, There is not FOC value so FOC1_QTY and FOC2_QTY must be 0. 

我想拉出查詢類似下面的表格。

ITEM_NO FOC1_QTY FOC2_QTY SALE_QTY 
P00001 10  100   100 
P00002 0  0    100 
P00004 0  0    100 

如何做上述表的SQL查詢..

Answer 1

試試這個，

DECLARE @T TABLE(ITEM_NO VARCHAR(10),REM1 INT,QTY INT) 
INSERT INTO @T VALUES ('P00001',NULL,100), 
         ('P00001',1,10), 
         ('P00001',2,100) 

SELECT ITEM_NO 
     ,[1] FOC1_QTY 
     ,[2] FOC2_QTY 
     ,[0] SALE_QTY 
FROM (
     SELECT ITEM_NO,ISNULL(REM1,0)REM1,QTY FROM @T 
     )A 
PIVOT(
    MAX(QTY) FOR REM1 IN([1],[2],[0]) 
    )PVT