Week 3 Discussion 2

"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.