從單個文本列創建多列，有點像樞軸

Question

這似乎很簡單，但我不能得到我需要的結果...

我有一個類別，日期和一個代碼：

Cat Dt   Code 
A 2013-07-02 X1 
A 2013-07-02 Y4 
A 2013-07-02 L2 
A 2013-07-02 M8 
A 2013-07-02 H7 
A 2013-07-02 P4 

，並希望這樣的回報是：

Cat Dt   Code1 Code1 Code3 Code4 Code5 Code6 
A  2013-07-02 X1  Y4  L2  M8  H7  P4 

- 一些SQL與...

CREATE TABLE dbo.test1 (Cat VARCHAR(8), Dt DATE, Code VARCHAR(8)) 

INSERT INTO dbo.test1 (Cat, Dt, Code) 

-- This set should return a value in all 6 Code columns... 

SELECT 'A', '2013-07-02', 'X1' 
UNION SELECT 'A', '2013-07-02', 'Y4' 
UNION SELECT 'A', '2013-07-02', 'L2' 
UNION SELECT 'A', '2013-07-02', 'M8' 
UNION SELECT 'A', '2013-07-02', 'H7' 
UNION SELECT 'A', '2013-07-02', 'P4' 

-- This set should have a NULL in Code6 since there are only 5 codes 

UNION SELECT 'B', '2013-07-03', 'Y6' 
UNION SELECT 'B', '2013-07-03', 'D5' 
UNION SELECT 'B', '2013-07-03', 'F8' 
UNION SELECT 'B', '2013-07-03', 'G9' 
UNION SELECT 'B', '2013-07-03', 'J2' 

-- This set should have a NULL in Code6 since there are only 5 distinct codes 

UNION SELECT 'C', '2013-07-04', 'D1' 
UNION SELECT 'C', '2013-07-04', 'D1' 
UNION SELECT 'C', '2013-07-04', 'U3' 
UNION SELECT 'C', '2013-07-04', 'T9' 
UNION SELECT 'C', '2013-07-04', 'G4' 


-- This set has 7, but I only care about 6 of them. Which 6 doesn't matter, just any of the 6 codes 

UNION SELECT 'D', '2013-07-05', 'T1' 
UNION SELECT 'D', '2013-07-05', 'Y2' 
UNION SELECT 'D', '2013-07-05', 'U3' 
UNION SELECT 'D', '2013-07-05', 'I9' 
UNION SELECT 'D', '2013-07-05', 'P8' 
UNION SELECT 'D', '2013-07-05', 'L7' 
UNION SELECT 'D', '2013-07-05', 'J6' 

測試

任何幫助，將不勝感激

Answer 1

這是一種方式，而無需使用PIVOT：

;WITH CTE AS 
(
    SELECT *, 
      RN=ROW_NUMBER() OVER(PARTITION BY Cat, Dt ORDER BY Cat, Dt) 
    FROM dbo.test1 
) 
SELECT Cat, 
     Dt, 
     MIN(CASE WHEN RN = 1 THEN Code END) Code1, 
     MIN(CASE WHEN RN = 2 THEN Code END) Code2, 
     MIN(CASE WHEN RN = 3 THEN Code END) Code3, 
     MIN(CASE WHEN RN = 4 THEN Code END) Code4, 
     MIN(CASE WHEN RN = 5 THEN Code END) Code5, 
     MIN(CASE WHEN RN = 6 THEN Code END) Code6 
FROM CTE 
GROUP BY Cat, 
     Dt