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2015年2月6日
【oracle】union、union all、intersect、minus 的用法及区别
摘要： 一、union与union all首先建两个viewcreate or replace view test_view_1 asselect 1 as a, 1 as b, 1 as c from dualunionselect 2 as a, 2 as b, 2 as c from dualunio... 阅读全文
posted @ 2015-02-06 14:28 uzipi 阅读(2096) 评论(0) 推荐(0) 编辑