Question: Note the following: The Invoice Number attribute was copied from INVOICE to INVOICE LINE ITEM, and Product Number was added to it to form the

Note the following:

The Invoice Number attribute was copied from INVOICE to INVOICE LINE ITEM, and Product Number was added to it to form the primary key of the INVOICE LINE ITEM relation.

The entire repeating group (Product Number, Product Description, Quantity, Unit Price, and Extended Amount) was removed from the INVOICE relation.

Invoice Number is still the primary key in INVOICE, and it now also serves as a foreign key in INVOICE LINE ITEM as well as being part of the primary key of INVOICE LINE ITEM.

There are no repeating groups or multivalued attributes in the relations, so they are therefore in first normal form.

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