樞軸查詢問題

Question

我在T-SQL表函數，在3項返回一個分裂值對作業編號

例如

JobNumber SplitValue 
J1    A 
J1    B 
J1    C 

任何人都可以使用，將改變一個支點聲明幫助結果集 所以我得到

JobNumber SplitValue1, SPlitValue2, SPlitValue3 

？

在此先感謝

Answer 1

以下Oracle下應該工作，我希望它可以幫助你得到一個想法：

WITH t AS 
(SELECT 'J1' JOBNUMBER, 'A' SPLITVALUE FROM dual 
    UNION ALL 
    SELECT 'J1' JOBNUMBER, 'B' SPLITVALUE FROM dual 
    UNION ALL 
    SELECT 'J1' JOBNUMBER, 'C' SPLITVALUE FROM dual 
    UNION ALL 
    SELECT 'J2' JOBNUMBER, 'Z' SPLITVALUE FROM dual 
    UNION ALL 
    SELECT 'J2' JOBNUMBER, 'X' SPLITVALUE FROM dual 
    UNION ALL 
    SELECT 'J2' JOBNUMBER, 'Y' SPLITVALUE FROM dual) 
---- 
    select JOBNUMBER, max(SPLITVALUE1), max(SPLITVALUE2), max(SPLITVALUE3) 
    from (
    select 
    JOBNUMBER, 
    case when row_number() over (partition by jobnumber order by SPLITVALUE) = 1 then SPLITVALUE else null end SPLITVALUE1, 
    case when row_number() over (partition by jobnumber order by SPLITVALUE) = 2 then SPLITVALUE else null end SPLITVALUE2, 
    case when row_number() over (partition by jobnumber order by SPLITVALUE) = 3 then SPLITVALUE else null end SPLITVALUE3 
    from t) 
group by JOBNUMBER order by jobnumber 

輸出：

JOBNUMBER SPLITVALUE1  SPLITVALUE2  SPLITVALUE3 
--------- ---------------- ---------------- ---------------- 
J1  A    B    C 
J2  X    Y    Z