CIS 515 WEEK 2 DISCUSSION II

CIS 515 WEEK 2 DISCUSSION II
Preparing an Adequate Data Model Please respond to the following
	Using specialization hierarchies can provide an efficient application development structure. Justify the use of surrogate primary keys for a database design. Provide an example to support your response.
•	Historical data can be important to measuring performance. Prepare an example on how time-variant data can be properly captured and maintained within a database system.

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