练习：账号信息表，用户组，主机表，主机组
#用户表
mysql> create table user( id int not null unique auto_increment, username varchar(50) not null, password varchar(50) not null, primary key(username,password)); Query OK, 0 rows affected (0.12 sec)
插入用户信息mysql> insert into user(username,password) values(‘root‘,‘123‘),(‘alex‘,‘1234‘),(‘mike‘,‘1234‘); Query OK, 3 rows affected (0.01 sec) Records: 3 Duplicates: 0 Warnings: 0 mysql> select * from user; +----+----------+----------+ | id | username | password | +----+----------+----------+ | 1 | root | 123 | | 2 | alex | 1234 | | 3 | mike | 1234 | +----+----------+----------+ 3 rows in set (0.09 sec)
#用户组表
mysql> create table usergroup( id int primary key auto_increment, groupname varchar(20) not null unique); Query OK, 0 rows affected (0.21 sec) mysql> insert into usergroup(groupname) values (‘IT‘), (‘sale‘), (‘Finance‘), (‘boss‘); Query OK, 4 rows affected (0.10 sec) Records: 4 Duplicates: 0 Warnings: 0 mysql> select * from usergroup; +----+-----------+ | id | groupname | +----+-----------+ | 4 | boss | | 3 | Finance | | 1 | IT | | 2 | sale | +----+-----------+ 4 rows in set (0.00 sec)
#主机表
mysql> create table host( id int primary key auto_increment, ip char(16) not null unique default ‘127.0.0.1‘); Query OK, 0 rows affected (0.13 sec
插入ip记录
insert into host(ip) values (‘172.16.45.2‘), (‘172.16.31.10‘), (‘172.16.45.3‘), (‘172.16.31.11‘), (‘172.10.45.3‘), (‘172.10.45.4‘), (‘172.10.45.5‘), (‘192.168.1.20‘), (‘192.168.1.21‘), (‘192.168.1.22‘), (‘192.168.2.23‘), (‘192.168.2.223‘), (‘192.168.2.24‘), (‘192.168.3.22‘), (‘192.168.3.23‘), (‘192.168.3.24‘) ;
#业务线表mysql> create table business(id int primary key auto_increment,business varchar(20) not null unique);
Query OK, 0 rows affected (0.20 sec)
mysql> insert into business(business) values
-> (‘轻松贷‘),
-> (‘随便花‘),
-> (‘大富翁‘),
-> (‘穷一生‘)
-> ;
Query OK, 4 rows affected (0.04 sec)
Records: 4 Duplicates: 0 Warnings: 0
‘
多对多关系练习
’
#建关系：user与usergroup
创建一张user2usergroup表create table user2usergroup( id int not null unique auto_increment, user_id int not null, group_id int not null, primary key(user_id,group_id), foreign key(user_id) references user(id) on delete cascade on update cascade, foreign key(group_id) references usergroup(id) on delete cascade on update cascade );
插入记录
mysql> insert into user2usergroup(user_id,group_id) values(1,1),(1,2),(1,3),(1,4),(2,3),(2,4),(3,4); Query OK, 7 rows affected (0.09 sec) Records: 7 Duplicates: 0 Warnings: 0 mysql> select * from user2usergroup; +----+---------+----------+ | id | user_id | group_id | +----+---------+----------+ | 1 | 1 | 1 | | 2 | 1 | 2 | | 3 | 1 | 3 | | 4 | 1 | 4 | | 5 | 2 | 3 | | 6 | 2 | 4 | | 7 | 3 | 4 | +----+---------+----------+ 7 rows in set (0.00 sec)
#建关系：host与business
create table host2business( id int not null unique auto_increment, host_id int not null, business_id int not null, primary key(host_id,business_id), foreign key(host_id) references host(id) on delete cascade on update cascade, foreign key(business_id) references business(id) on delete cascade on update cascade );
insert into host2business(host_id,business_id) values (1,1), (1,2), (1,3), (2,2), (2,3), (3,4) ;
#建关系：user与host
create table user2host( id int not null unique auto_increment, user_id int not null, host_id int not null, primary key(user_id,host_id), foreign key(user_id) references user(id) on delete cascade on update cascade, foreign key(host_id) references host(id) on delete cascade on update cascade );
insert into user2host(user_id,host_id) values (1,1), (1,2), (1,3), (1,4), (2,2), (2,3), (2,4), (2,5), (3,10), (3,11), (3,12) ;
ysql> select * from user2host; +----+---------+---------+ | id | user_id | host_id | +----+---------+---------+ | 1 | 1 | 1 | | 2 | 1 | 2 | | 3 | 1 | 3 | | 4 | 1 | 4 | | 5 | 2 | 2 | | 6 | 2 | 3 | | 7 | 2 | 4 | | 8 | 2 | 5 | | 9 | 3 | 10 | | 10 | 3 | 11 | | 11 | 3 | 12 | +----+---------+---------+ 11 rows in set (0.00 sec)
原文地址：https://www.cnblogs.com/mingerlcm/p/9867670.html
时间： 2024-10-04 04:13:27