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：
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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;
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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);
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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
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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;
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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：
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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;
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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);
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查询语句：
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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;
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结果展示：
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原文链接：http://blog.csdn.net/jx_870915876/article/details/52403472