mysql横向转纵向、纵向转横向排列的方法

初始化数据

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drop table if exists `test_01`; create table `test_01` (   `id` int (0) not null ,   ` user ` varchar (255) character set utf8mb4 collate utf8mb4_0900_ai_ci null default null comment '用户' ,   `km` varchar (255) character set utf8mb4 collate utf8mb4_0900_ai_ci null default null comment '科目' ,   `fs` varchar (255) character set utf8mb4 collate utf8mb4_0900_ai_ci null default null comment '分数' ,   ` time ` datetime(0) null default null comment '时间' ,   primary key (`id`) using btree ) engine = innodb character set = utf8mb4 collate = utf8mb4_0900_ai_ci row_format = dynamic ;   insert into `test_01` values (1, '小三' , '语文' , '98' , '2020-08-06 15:51:21' ); insert into `test_01` values (2, '小三' , '数学' , '90' , '2020-07-01 15:51:25' ); insert into `test_01` values (3, '小三' , '英语' , '77' , '2020-06-01 15:51:28' ); insert into `test_01` values (4, '小二' , '英语' , '78' , '2020-06-01 15:51:28' );

一、横向转纵向排列

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select      user ,      sum ( case when km = "语文" then fs else 0 end ) "语文" ,      sum ( case when km = "数学" then fs else 0 end ) "数学" ,      sum ( case when km = "英语" then fs else 0 end ) "英语" from      test_01 group by user

二、纵向转横向排列

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select km from test_01 where id = 1 union select fs from test_01 where id = 1

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原文链接：https://blog.csdn.net/weixin_44325655/article/details/107841272