日期:2014-05-18  浏览次数:20728 次

求助:关于列转行
小弟现有这样一张表:
ITEM PRO1 PRO2 PRO3 PRO4 PRO5
A 1 0 0 1 0
B 1 0 1 1 0
C 0 1 0 0 0
D 0 0 1 1 0
E 0 0 0 1 0

要求转成如下结果:

ITEM PRO
A PRO1
A PRO4
B PRO1
B PRO3
B PRO4
C PRO2
D PRO3
D PRO4
E PRO4

实际表中由于列数众多,有60多列,因此不可能用UNION一个select item, pro .... UNION...这样的方法转
请教如何操作?先谢过了

------解决方案--------------------
用UNPIVOT
http://technet.microsoft.com/zh-cn/library/ms177410.aspx#Mtps_DropDownFilterText
------解决方案--------------------
参照例子
http://topic.csdn.net/u/20080614/17/22e73f33-f071-46dc-b9bf-321204b1656f.html
------解决方案--------------------
SQL code
create table tb(ITEM VARCHAR(2),PRO1 BIT,PRO2 BIT ,PRO3 BIT ,PRO4 BIT ,PRO5 BIT)
INSERT INTO TB (ITEM,PRO1,PRO2,PRO3,PRO4,PRO5)
SELECT 'A',1,0,0,1,0 UNION ALL
SELECT 'B',1,0,1,1,0 UNION ALL
SELECT 'C',0,1,0,0,0 UNION ALL
SELECT 'D',0,0,1,1,0 UNION ALL
SELECT 'E',0,0,0,1,0
GO
SELECT * FROM tb
GO
DECLARE @SQL VARCHAR(MAX)
SET @SQL='SELECT ITEM,PRO FROM ('+CHAR(10)
SET @SQL=@SQL+'SELECT ITEM,PRO1 AS value,''PRO1'' AS PRO FROM TB'+CHAR(10)
SELECT @SQL=@SQL+'UNION ALL SELECT ITEM,'+NAME+','''+NAME+''' FROM TB '+CHAR(10) FROM SYSCOLUMNS WHERE ID=OBJECT_ID('TB') AND name NOT IN('ITEM','PRO1')
SET @SQL=@SQL+') A where value=1 order by item'
exec  (@SQL)

结果为:

ITEM    PRO
A    PRO1
A    PRO4
B    PRO4
B    PRO1
B    PRO3
C    PRO2
D    PRO3
D    PRO4
E    PRO4

(9 行受影响)