行转列或列转行写法

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行转列或列转行写法

杰克.陈 2015-03-05 09:49:00 浏览329
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原文: 行转列或列转行写法

两种方式:

/*	
实现行转列
a
name	objec	score
a		EN		89
a		CH		78
a		HO		99
b		EN		34
b		CH		88
b		HO		66
要求输出结果为:
name	EN	CH	HO
a		89	78	99
b		34	88	66
*/

USE tempdb
IF (SELECT 1 FROM sys.sysobjects WHERE name ='t' AND type='u') is NOT NULL 
DROP TABLE t


CREATE TABLE t
(
	NAME	CHAR(10),
	objec	CHAR(10),
	score	FLOAT
)
INSERT INTO t
VALUES('a','EN',89),('a','CH',78),('a','HO',99),('b','EN',34),('b','CH',88),('b','HO',66)

SELECT * FROM T

SELECT NAME ,MAX(CASE objec WHEN 'EN' THEN score ELSE 0 END ) EN,MAX(CASE objec WHEN 'CH' THEN score ELSE 0 END ) CH,MAX(CASE objec WHEN 'HO' THEN score ELSE 0 END ) HO
FROM t
GROUP BY NAME 
--=======================================================================================================================================================
/*	
实现行转列
a
name	objec	score
a		EN		89
a		CH		78
a		HO		99
b		EN		34
b		CH		88
b		HO		66
要求输出结果为:
name	objec		totalsorce
a		EN,CH,HO	266
b		EN,CH,HO	188
*/

USE tempdb
IF (SELECT 1 FROM sys.sysobjects WHERE name ='t' AND type='u') is NOT NULL 
DROP TABLE t

CREATE TABLE t
(
	NAME	CHAR(10),
	objec	CHAR(10),
	score	FLOAT
)
INSERT INTO t
VALUES('a','EN',89),('a','CH',78),('a','HO',99),('b','EN',34),('b','CH',88),('b','HO',66)

SELECT * FROM T

--为了去除objec中的最后一个逗号,插入一个临时表,并使用substring处理
SELECT name ,(SELECT LTRIM(RTRIM(objec))+',' FROM T WHERE objec=t.objec FOR XML PATH('')) objec,SUM(temp.score) totalscroe INTO #tmp
FROM T temp
GROUP BY name 


SELECT NAME ,SUBSTRING(objec,0,LEN(objec)-1) objec ,totalscroe
FROM #tmp


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