create database stu;
use stu;
create table stu(
  stuId int primary key auto_increment,
  stuNum int,
  stuName varchar(30),
  stuSex varchar(30),
  stuAge int,
  stuQQ varchar(30)
);
insert into stu values(null,1,"tom1","female",18,"12646123");
insert into stu values(null,2,"tom2","female",18,"12646123");
insert into stu values(null,3,"tom3","female",18,"12646123");
insert into stu values(null,4,"tom4","female",18,"12646123");
insert into stu values(null,5,"tom5","female",18,"12646123");
insert into stu values(null,6,"tom6","female",18,"12646123");
insert into stu values(null,7,"tom7","female",18,"12646123");
insert into stu values(null,8,"tom8","female",18,"12646123");
insert into stu values(null,9,"tom9","female",18,"12646123");
insert into stu values(null,10,"tom10","female",18,"12646123");
insert into stu values(null,11,"tom11","female",18,"12646123");
insert into stu values(null,12,"tom12","female",18,"12646123");


delete from stu where stuId=12;

update stu  set stuNum=100,stuName='mary',stuSex='male',stuAge=20,stuQQ='123456' where stuId=2;

10Ìõ
(pg-1)*10
select * from stu limit 10 ,10;