【Oracle学习笔记-5--】集合操作之union，intersect和minus操作

select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘C%‘unionselect e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘S%‘;--等价于select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘C%‘or e.last_name like ‘S%‘; 技术分享

-- intersect交集操作select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘C%‘or e.last_name like ‘S%‘intersectselect e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘S%‘or e.last_name like ‘T%‘;--等价于select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘S%‘; 技术分享

--minus差操作select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘C%‘or e.last_name like ‘S%‘minusselect e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘S%‘or e.last_name like ‘T%‘;--等价于select e.employee_id,e.last_name from hr.employees ewhere e.last_name like ‘C%‘; 技术分享

博客：http://www.cnblogs.com/ssslinppp http://blog.sina.com.cn/spstudy 淘宝-代做毕设：http://shop110473970.taobao.com/?spm=a230r.7195193.1997079397.42.AvYpGW http://shop125186102.taobao.com/?spm=a1z10.1-c.0.0.SsuajD

来自为知笔记(Wiz)

【Oracle学习笔记-5--】集合操作之union，intersect和minus操作

标签：