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...
View Full Document
- Spring '08
- Relational model, Database Systems Notes, maximum cardinality rules