SQL SERVER中行列转换

 1 DECLARE @subject varchar(2000)
 2 DECLARE @name varchar(2000)
 3 DECLARE @colName varchar(500)  --声明@colName变量，获取列名科目
 4 set @colName = ''
 5 
 6 --INFORMATION_SCHEMA.COLUMNS数据库的表名称，获取表名为A_Table中列名不为name的其他列名,@colName=[Chinese],[Math],[English],[History],[Geography],[Organism],[Chymistry],
 7 SELECT @colName=@colName+'['+COLUMN_NAME+'],' FROM INFORMATION_SCHEMA.COLUMNS WHERE TABLE_NAME='A_Table' AND COLUMN_NAME!='name'
 8 
 9 --从表A_Table中获取字段Name的值,@name=[张三],[李四],[王五],[赵六],
10 select @name=LEFT(name,LEN(name)-1) from (select (SELECT '['+Name+'],' FROM A_Table FOR XML PATH('')) as name) as a
11 
12 --@subject=[Chinese],[Math],[English],[History],[Geography],[Organism],[Chymistry]
13 select @subject=subString(@colName,1,len(@colName)-1)
14 
15 --UNPIVOT用于列转行
16 --PIVOT用于将列值旋转为列名（即行转列）,语法是：PIVOT(聚合函数(列) FOR 列 in (…) )AS P
17 exec(
18     '
19     select * from
20     (
21         SELECT name,CAST(kemu as FLOAT) as kemu,科目 
22         FROM A_Table as t
23         unpivot(kemu for 科目 in('+@subject+')) as b
24     ) as a
25     pivot(sum(kemu) for name in('+@name+')) as b
26     '
27 )
28 
29 --原表A_Table
30 select * from A_Table

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