SQL增删改查

--创建数据库

create database ios

--使用数据库

use ios

--创建数据表

create table student

(

stuid int primary key autoincrement,

stuname varchar(20),

stupwd varchar(20)

)

--查询所有信息

select * from student

 

--增加信息

insert into student(stuname,stupwd)

values ('lisi','123456')

--修改

update student set stuname = '李四'

where stuid = 1

update student set stuname = '李四',stupwd='Sd123'

where stuid = 1

--删除

delete from student where stuid=1

—做登录时使用

select *from student where shtuname=‘lisi’ and stupwd=‘123123'

--显示指定信息

select tsunami from student

—根据指定进行排序   默认是升序排列（asc）降序排列（desc）

select tsunami from student order by stuname desc