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10 Things You Need to Know about Relationships in Access 2013

Enforce referential integrity in the Edit Relationships dialog to prevent “orphan” record entry in the child table.

An orphan is a record in the child table that doesn’t have a corresponding record in the parent table. The classic example is an order in an Orders table for a customer not in the Customers table. Referential integrity prevents entering these kinds of orphan orders.

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