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How to fill the intermediate table created from Many-Many relationship?

Question asked by on Sep 8, 2011
How to make a relationship between feature class in geodatabase with a table in Microsoft Access file?

Please, see the attached table that shows my question

In the real life, I�??m facing the challenge below:

The tabular data of the parcel is saved in tables like Excel, Access, oracle, etc. while the drawing data of parcels are saved in geodatabase. Now:

How can we make a relationship between our parcels which exists in the geodatabase and an external table?

Why building a relationship in ArcGIS requires the origin and the destination to be saved in the geodatabase?

What if I need the destination to be saved out the geodatabase?