values ('51b28fe1-4ebf-41ac-a17b-d5e276861fd0','fuliuqingfeng','123456'); create table address( id char(36) primary key, user_info_id char(36), real_name varchar(8) not null, mobile char(11) not null, address varchar(150) not null ) insert into address (id,user_info_id,real_name,mobile,address) values ('bfb9472a-7911-4e6f-a479-3b719454ebab','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','张三','18920120206','河南安阳'); insert into address (id,user_info_id,real_name,mobile,address) values ('5227c6b9-45a2-44aa-8ac0-1f63a38d3b65','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','李四','18617297545','北京海淀'); insert into address (id,user_info_id,real_name,mobile,address) values ('30b8584b-aa6a-4516-a623-03f487058586','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','王五','17694976949','山西大同');

• 1
• 2
• 3
• 4
• 5
• 6
• 7
• 8
• 9
• 10
• 11
• 12
• 13
• 14
• 15
• 16
• 17
• 18
• 19
• 20

创建两个表单，这种表结构消除了字段冗余，但由于只是逻辑上的“外键”关系，所以依然无法保证数据完整性，例如可以将user_xxx中id为51b28fe1-4ebf-41ac-a17b-d5e276861fd0的数据删除，但此时地址表中数据将不再完整——找不到这些地址属于哪个用户；再例如也可以向address表中添加一条user_xxx_id不存在的地址信息（如：insert into address (id,user_xxx_id,real_name,mobile,address) values ('7da42cc6-36a6-4ad5-9998-71dbc30c8e17','ddc376dd-f8b3-42a6-b42a-db22abed1941','xiaowang','18338970095','北京东城区');）——同样，该条数据并不完整，依然找不到这些地址属于哪个用户。

create table user_xxx(
  id char(36) primary key,
  user_name varchar(30) not null,
  password varchar(30) not null
)
insert into user_xxx (id,user_name,password) values ('51b28fe1-4ebf-41ac-a17b-d5e276861fd0','fuliuqingfeng','123456');

create table address(
  id char(36) primary key,
  user_xxx_id char(36),
  real_name varchar(8) not null,
  mobile char(11) not null,
  address varchar(150) not null,
  constraint address_user_xxx_id_fk foreign key(user_xxx_id) references user_xxx(id)
)
insert into address (id,user_xxx_id,real_name,mobile,address) 
values ('bfb9472a-7911-4e6f-a479-3b719454ebab','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','张三','18920120206','河南安阳');
insert into address (id,user_xxx_id,real_name,mobile,address) 
values ('5227c6b9-45a2-44aa-8ac0-1f63a38d3b65','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','李四','18617297545','北京海淀');
insert into address (id,user_xxx_id,real_name,mobile,address) 
values ('30b8584b-aa6a-4516-a623-03f487058586','51b28fe1-4ebf-41ac-a17b-d5e276861fd0','王五','17694976949','山西大同');

• 1
• 2
• 3