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mysql sql语句总结(不断更新中.........)

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2016-06-06 20:01:45986browse

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


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; //从第6条开始(包括),查2条

 

//查看表的数据结构
SHOW COLUMNS FROM tablename;
查出后以下字段:
Field type Null key default extra

 

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