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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.

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