//插入数据
insert into result values('0001',60,20,80);
insert into result values('0002',80,60,80);
insert into result values('0003',20,85,80);
select *from result;
//条件查询
select stu_id,(case
when china>80 then '优秀'
when china>=60 then '及格'
when china<60 then '不及格'
end) as 语文 ,
(case
when math>80 then '优秀'
when math>=60 then '及格'
when math<60 then '不及格'
end )as 数学 ,
(case
when english>80 then '优秀'
when english>=60 then '及格'
when english<60 then '不及格'
end) as 英语
from result
