完成下例sql语句的编写
用户表
create table user(
id int not null unique auto_increment,
username varchar(20) not null,
password varchar(50) not null,
primary key(username,password)
);
insert into user(username,password) values
(\'root\',\'123\'),
(\'egon\',\'456\'),
(\'alex\',\'alex3714\')
;
用户组表
create table usergroup(
id int primary key auto_increment,
groupname varchar(20) not null unique
);
insert into usergroup(groupname) values
(\'IT\'),
(\'Sale\'),
(\'Finance\'),
(\'boss\')
;
主机表
create table host(
id int primary key auto_increment,
ip char(15) not null unique default \'127.0.0.1\'
);
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
create table business(
id int primary key auto_increment,
business varchar(20) not null unique
);
insert into business(business) values
(\'轻松贷\'),
(\'随便花\'),
(\'大富翁\'),
(\'穷一生\')
;
建关系：user与usergroup
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),
foreign key(group_id) references usergroup(id)
);
insert into user2usergroup(user_id,group_id) values
(1,1),
(1,2),
(1,3),
(1,4),
(2,3),
(2,4),
(3,4)
;
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),
foreign key(business_id) references business(id)
);
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),
foreign key(host_id) references host(id)
);
insert into user2host(user_id,host_id) values
(1,1),
(1,2),
(1,3),
(1,4),
(1,5),
(1,6),
(1,7),
(1,8),
(1,9),
(1,10),
(1,11),
(1,12),
(1,13),
(1,14),
(1,15),
(1,16),
(2,2),
(2,3),
(2,4),
(2,5),
(3,10),
(3,11),
(3,12);