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:
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。