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