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Unformatted text preview: Null Values- Empty with no data Primary and Foreign Keys What is redundancy-duplicate we want more load less redundancy, load, how to link tables- start with maximum cardinality rules for linking (they deal with redundancy considerations) and then move to minimum when dealing with load. o Maximum card = redundancy o Minimum card = load Referential integrity, entity integrity Five types of events for the purchasing process- instigation, commitment, purchase, cash disbursements, returns p82...
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- Spring '08