Unformatted text preview: D3. It is considered an implementation compromise because a pure relational theory would not allow a null value in a database table. Having an implementation relationship allows null values as long as the data follows the cardinality pattern. Participation of a cash receipt is optional; a cash receipt could exist without a related customer. So the values for some customers could be null. D4. A company may decide to roll up its cash disbursement event activity to control the growth of the event activity. They may want to wait until the event history details are no longer needed and then roll the data into a single event occurrence. This would be considered a physical implementation compromise....
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- Fall '11
- Accounting, Relational model, supervisor, Cash Account, Megan Matthews, cash account types