SQLSERVER行转列

最近面试遇到了一道面试题，顿时有点迷糊，只说出了思路，后来百度了一下，整理了一下思路，于是记录下来，方便以后学习。（面试题请参见附件）

相关的数据表：

1.Score表

2.[User]表

SQL语句如下：

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

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

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 编号,
  UID as 用户编号,
  Name as 姓名,
  max(case ScoreName when ‘英语‘ then Score else 0 end) 英语,
  max(case ScoreName when ‘数学‘ then Score else 0 end) 数学
from Score,[User] WHERE Score.UID=[User].ID
group by UID,[User].ID,Name

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