create database mytest default charset=utf8 //创建数据库
create table users //创建表
(
user_id int not null auto_increment,
user_name varchar(20) not null,
description varchar(200),
primary key PK_userid(user_id)
);
show create table users;//查看创建表的sql语句
desc users; //查看表结构
alter table users add(user_age int not null); //添加表字段
insert into users(user_name,description,user_age) values('chen','this is good men.',28); //插入一条数据
//查询数据库
select * from users limit 5; //查询前5条
SELECT * FROM users LIMIT 6,2; //从弟6条开始，查2条