oracle多表联合查询

oracle联合查询

并集（去重复）：

select * from t_user1 
union
select * from t_user2;
并集：
select * from t_user1 
union all
select * from t_user2;

交集：
select * from t_user1
intersect
select * from t_user2;

差集：
select * from t_user1 
minus
select * from t_user2;