create table employee ( num int(50),

                        d_id int(50),

                        name varchar(50),

                        age int(50),

                        sex varchar(50),

                        homeadd varchar(50)

                       );

insert into employee values(1,1001,'zhangsan',26,'nan','beijing');

insert into employee values(2,1001,'lisi',24,'nv','hunan');

insert into employee values(3,1002,'wangwu',25,'nan','jiangsu');

insert into employee values(4,1004,'aric',15,'nan','yingguo');

select * from employee;

create table department ( d_id int(50),

                          d_name varchar(50),

                          functione varchar(50),

                          address varchar(50)

                        );

insert into department values(1001,'keyanbu','yanfachanpin','3lou5hao');

insert into department values(1002,'shengchanbu','shengchanchanp','5louyiceng');

insert into department values(1003,'xiaoshoubu','cehuaxiaoshou','1louxiaoshoudating');

select * from department;

select d_id from department union select d_id from employee;

select d_id from department union all select d_id from employee;