Consider whether it is appropriate to introduce the enhanced concepts of specialization/generalization, aggregation, and/or composition into the ER model for the case study described in If appropriate, redraw the ER diagram as an EER diagram with the additional enhanced concepts.
What will be an ideal response?
Consider Manager as a specialization of the Staff entity. This would move the Manages
relationship from Staff to the Manager subclass. However, the attributes for both entities
would be the same and there would, therefore, seem to be no obvious advantage to introducing
the Manager specialization.
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Case-based Critical Thinking QuestionsCase 13-1Judy wants to be able to validate the XML documents that she uses for recipes. These documents include numeric elements that specify ingredient amounts and cooking times, so you recommend that she use a schema instead of a DTD, and you teach her some of the key facts about schemas. Which of the following is NOT an advantage of schemas over DTDs?
A. They are more flexible than DTDs in dealing with mixed content. B. They support more data types than DTDs. C. They provide better support for namespaces. D. They are simpler to create and maintain.
What is Opacity property?
What will be an ideal response?
If you wanted to count the number of entries in a list that contained numbers, text, and blank cells, but ignore the blank cells, which function would you use?
A) COUNTBLANK B) COUNTA C) COUNTIF D) COUNT
You are in the process of purchasing the components that you will put together for a new server that will run Windows Server 2012. You want to make sure that the components you are buying will work with the OS. What should you check before making the purchase?
What will be an ideal response?