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Why self relationship is required and what are limitations over it?

  While reading about relationships in salesforce I found self relationship ( Lookup relation to same object) , so why this kind of relationship is required can anybody please explain with suitable scenario, and also please specify limitations of it.

Thanks in advance.
Evan KennedyEvan Kennedy
Think of an account that has a parent account. Or a project that has a parent project. This would be a lookup to the same object.

The limitations of this are the same limitations of any other relationship. You can only go 4-5 levels when traversion relationships in a query, I believe.