TSQL查詢樞轉

Question

我有一個表晶格結構（高爾夫記分卡）如下：

HoleID int 
CourseID int 
Par INT 
Distance INT 
LowIndex INT 
HighIndex INT 
Sequence INT (representing the sequence of the hole: 1, 2, 3, ... 18) 

這門課程有18個孔。

我想回轉到：

Hole,  1, 2, 3, ... 18 
Par,  X, X, X, ... X 
Distance, Y, Y, Y, ... Y 
LowIndex, Z, Z, Z, ... Z 
HighIndex, A, A, A, ... A 

我可以使用光標實現這一點，但有沒有更好的辦法？

Answer 1

TSQL直接支持pivoting。例如，看看here和here。

Answer 2

你可以做

SELECT HoleID FROM Card WHERE HoleId =1 ,(SELECT HoleID FROM Card WHERE HoleId =2) , -- etc 

UNION 
SELECT Par FROM Card WHERE HoleId = 1, (SELECT Par FROM Card where HoleID=2). --etc 
UNION 
SELECT Distance FROM Card WHERE HoleId = 1, (SELECT Distance FROM Card where HoleID=2). --etc 
UNION 
SELECT LowIndex FROM Card WHERE HoleId = 1, (SELECT LowIndex FROM Card where HoleID=2). --etc 
UNION 
SELECT HIghIndex FROM Card WHERE HoleId = 1, (SELECT HighIndex FROM Card where HoleID=2). --etc 

如果你不顧一切地擺脫光標。

確保你讓所有的數據類型，通過鑄造或東西是相同的。

Answer 3

明白了只有第一部分......，會做。

select [1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18] 
from (Select Sequence, Par FROM holes WHERE CourseID=1) a 

PIVOT 
(
    Max(Par) 
    FOR [Sequence] IN ([1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18]) 

) AS p 

Answer 4

完整列表：

select 'Par', [1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18] 
from (Select Sequence, Par FROM holes WHERE CourseID=1) a 

PIVOT 
(
    Max(Par) 
    FOR [Sequence] IN ([1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18]) 

) AS p 

UNION 

select 'Distance', [1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18] 
from (Select Sequence, Distance FROM holes WHERE CourseID=1) a 

PIVOT 
(
    Max(Distance) 
    FOR [Sequence] IN ([1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18]) 

) AS p 

UNION 


select 'LowIndex', [1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18] 
from (Select Sequence, LowIndex FROM holes WHERE CourseID=1) a 

PIVOT 
(
    Max(LowIndex) 
    FOR [Sequence] IN ([1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18]) 

) AS p 

UNION 

select 'HighIndex', [1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18] 
from (Select Sequence, HighIndex FROM holes WHERE CourseID=1) a 

PIVOT 
(
    Max(HighIndex) 
    FOR [Sequence] IN ([1],[2],[3],[4],[5],[6],[7],[8],[9], [10], [11], [12], [13], [14], [15], [16], [17], [18]) 

) AS p