create table student(
id int,
name varchar(10),
sex char(1),
age int,
dtdate date,
classname varchar(10),
email varchar(20)
)
alter table student add sro int;
alter table student add sro1 int first;
alter table student add sro2 int after id;
alter table student change sro sss int ;
alter table student drop sro1;
insert into student values(1,3,"姚","男",22,"2021-9-1","计科2105","2895872919@qq.com",77);