What are the aggregate objects in the data dictionary, Database Management System

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What are the aggregate objects in the data dictionary?

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#title., WHY SHOULD NULL IN A RELATION BE AVOID AS possible?

WHY SHOULD NULL IN A RELATION BE AVOID AS possible?

5/11/2013 2:56:59 AM Thanks for suggesting me this answer, appreciate your knowledge.

5/11/2013 2:56:59 AM

Thanks for suggesting me this answer, appreciate your knowledge.

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