create database mytest default charset=utf8 //創建數據庫 
create table users //創建表 
( 
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;//查看創建表的sql語句 
desc users; //查看表結構 
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); //插入一條數據 
//查詢數據庫 
select * from users limit 5; //查詢前5條 
SELECT * FROM users LIMIT 6,2; //從弟6條開始，查2條