复制代码 代码如下:

//创建成绩表

create table result(

stu_id varchar2(20) not null,

china number(9,2) null,

math number(9,2) null,

english number(9,2) null

);

//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