复制代码 代码如下: — 创建库 CREATE TABLE `rate` ( `uname` VARCHAR (300), `object` VARCHAR (300), `score` VARCHAR (300) ); — 插入数据 INSERT INTO test.rate (uname, object, score) VALUES(‘aaa’, ‘chinese’, ’67’), (‘aaa’, ‘math
复制代码 代码如下:– 创建库CREATE TABLE `rate` ( `uname` VARCHAR (300), `object` VARCHAR (300), `score` VARCHAR (300));
— 插入数据INSERT INTO test.rate (uname, object, score) VALUES(‘aaa’, ‘chinese’, ’67’), (‘aaa’, ‘math’, ’89’), (‘aaa’, ‘physical’, ’89’), (‘bbb’, ‘chinese’, ’67’), (‘bbb’, ‘math’, ’75’), (‘bbb’, ‘physical’, ’89’);
— 查询SELECT DISTINCT uname AS ‘姓名’,SUM(CASE objectWHEN ‘chinese’ THEN score END) AS ‘语文’,SUM(CASE objectWHEN ‘math’ THEN score END) AS ‘数学’,SUM(CASE objectWHEN ‘physical’ THEN score END) AS ‘物理’ FROM rate GROUP BY uname;
