oracle之set運算符和練習

--創建表
create table emp01
as
select * from employees
where department_id in (70,80)

--
--創建表
create table emp02
as
select * from employees
where department_id in (80,90)

--查詢 --並集
select * from employees
where department_id in (70,80)
union all
select * from employees
where department_id in (80,90)