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');
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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
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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