SQLServer行转列

近期面试遇到了一道面试题。顿时有点迷糊，仅仅说出了思路。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。（面试题请參见附件）

相关的数据表：

1.Score表

2.[User]表

SQL语句例如以下：

--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 ---列名不要反复  



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