SQLServer行轉列

最近面試遇到了一道面試題，頓時有點迷糊，只說出了思路，後來百度了一下，整理了一下思路，於是記錄下來，方便以後學習。（面試題請參見附件）

相關的資料表：

1.Score表

2.[User]表

SQL語句如下：

--方法一：靜態SQL
SELECT * FROM
(SELECT UID,Name, Score,ScoreName FROM Score,[User] WHERE Score.UID=[User].ID) AS SourceTable
PIVOT(AVG(Score)FOR ScoreName IN ([英語], [數學])) AS a

--方法二：動態SQL
DECLARE @s NVARCHAR(4000)  
SELECT @s = ISNULL(@s + ',', '') +  QUOTENAME(ScoreName)  
FROM  (select distinct ScoreName from Score) as A ---列名不要重複  

Declare @sql NVARCHAR(4000)  
SET @sql='  
 select r.* from  
(select UID,Name,ScoreName,Score from Score,[User] where Score.UID=[User].ID) as t  
pivot  
(  
max(t.Score)  
for t.ScoreName in ('+@s+')  
) as r'  
EXEC( @sql)

--方法三：Case When
select  
  row_number() OVER(ORDER BY [User].ID) as 編號,
  UID as 使用者編號,
  Name as 姓名,
  max(case ScoreName when '英語' then Score else 0 end) 英語,
  max(case ScoreName when '數學' then Score else 0 end) 數學
from Score,[User] WHERE Score.UID=[User].ID
group by UID,[User].ID,Name