mysql 将列值转变为列的技巧
发布时间：2021-12-03 21:54:17 所属栏目：教程 来源：互联网
导读：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, 8
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 object WHEN 'chinese' THEN score END) AS '语文', SUM(CASE object WHEN 'math' THEN score END) AS '数学', SUM(CASE object WHEN 'physical' THEN score END) AS '物理' FROM rate GROUP BY uname; （编辑：宁德站长网） 【声明】本站内容均来自网络，其相关言论仅代表作者个人观点，不代表本站立场。若无意侵犯到您的权利，请及时与联系站长删除相关内容! |
