(Answered) Preparing an adequate data model please respond to the

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"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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