#yyds干货盘点# 18 MySQL 创建一对一关系

一对一

• 创建用户表

CREATE TABLE users (
    
    id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    
    name VARCHAR(50) NOT NULL
    
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

• 用户信息表

CREATE TABLE users_info (
    
    id INT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    
    age int NOT NULL,
    
    phone varchar(11) NOT NULL,
    
    user_id int not null,
    constraint user_info foreign key(user_id) references users(id)
    
)ENGINE=InnoDB DEFAULT CHARSET=utf8;

插入数据

insert into users values (0,"小王");
insert into users values (0,"小宋");


insert into users_info values (0,12,'13812345678',1);
insert into users_info values (0,14,'13812345679',2);

• 查询人的全部信息

select * from users inner join users_info on
users_info.user_id =users.id;