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,
