创建表
create table exampleTable (course varchar(20),teacher varchar(20),student varchar(20),score int) ;
插入数据
insert into exampleTable (course,teacher,student,score) values ('数学',' 王华','丽丽',60);
insert into exampleTable (course,teacher,student,score) values ('数学',' 王华','李四',30);
insert into exampleTable (course,teacher,student,score) values ('语文',' 张三','丽丽',70);
insert into exampleTable (course,teacher,student,score) values ('语文',' 张三','李四',80);
现在查询学生李四和丽丽的数学成绩和语文成绩
select student,
sum(case course when '数学' then score else 0 end) as '数学' ,
sum(case course when '语文' then score else 0 end) as '语文'
from exampleTable group by student;