ITPub博客

首页 > Linux操作系统 > Linux操作系统 > Oracle Sort Join

Oracle Sort Join

原创 Linux操作系统 作者:chncaesar 时间:2013-11-08 23:17:36 0 删除 编辑

Sort join is the first operation of the “Sort Merge Join”. Before Oracle joins two row sources, both row sources have to be in order. If required, Oracle does a sort. The name is a bit misleading. All it does is a sort on the join key.

 

The “Sort Merge Join” consists of two steps:


  • Sort join operation. Both the inputs are sorted on the join key.
  • Merge join operation. The sorted lists are merged.


来自 “ ITPUB博客 ” ,链接:http://blog.itpub.net/638844/viewspace-776152/,如需转载,请注明出处,否则将追究法律责任。

上一篇: Oracle Hash Group By
下一篇: SQL Projection
请登录后发表评论 登录
全部评论

注册时间:2013-07-30

  • 博文量
    102
  • 访问量
    899720