mysql行转列、列转行

mysql行转列、列转行

 语句不难，不做多余解释了，看语句时，从内往外一句一句剖析

行转列

       有如图所示的表，现在希望查询的结果将行转成列

       建表语句如下：

CREATE TABLE `TEST_TB_GRADE` (
 `ID` int (10) NOT NULL AUTO_INCREMENT,
 `USER_NAME` varchar (20) DEFAULT NULL ,
 `COURSE` varchar (20) DEFAULT NULL ,
 `SCORE` float DEFAULT '0' ,
 PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

insert into TEST_TB_GRADE(USER_NAME, COURSE, SCORE) values
( "张三" , "数学" , 34),
( "张三" , "语文" , 58),
( "张三" , "英语" , 58),
( "李四" , "数学" , 45),
( "李四" , "语文" , 87),
( "李四" , "英语" , 45),
( "王五" , "数学" , 76),
( "王五" , "语文" , 34),
( "王五" , "英语" , 89);

       查询语句：

       此处用之所以用MAX是为了将无数据的点设为0，防止出现NULL

SELECT user_name ,
  MAX ( CASE course WHEN '数学' THEN score ELSE 0 END ) 数学,
  MAX ( CASE course WHEN '语文' THEN score ELSE 0 END ) 语文,
  MAX ( CASE course WHEN '英语' THEN score ELSE 0 END ) 英语
FROM test_tb_grade
GROUP BY USER_NAME;

       结果展示：

列转行

       有如图所示的表，现在希望查询的结果将列成行

       建表语句如下：

CREATE TABLE `TEST_TB_GRADE2` (
 `ID` int (10) NOT NULL AUTO_INCREMENT,
 `USER_NAME` varchar (20) DEFAULT NULL ,
 `CN_SCORE` float DEFAULT NULL ,
 `MATH_SCORE` float DEFAULT NULL ,
 `EN_SCORE` float DEFAULT '0' ,
 PRIMARY KEY (`ID`)
) ENGINE=InnoDB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

insert into TEST_TB_GRADE2(USER_NAME, CN_SCORE, MATH_SCORE, EN_SCORE) values
( "张三" , 34, 58, 58),
( "李四" , 45, 87, 45),
( "王五" , 76, 34, 89);

查询语句：

select user_name, '语文' COURSE , CN_SCORE as SCORE from test_tb_grade2
union select user_name, '数学' COURSE, MATH_SCORE as SCORE from test_tb_grade2
union select user_name, '英语' COURSE, EN_SCORE as SCORE from test_tb_grade2
order by user_name,COURSE;

       结果展示：

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