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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