DNSC-SAD 2018: Chapter 9

Puppy Palace Situation: Puppy Palace works with TV and movie producers who need dogs that can perform special tricks, such as headstands, somersaults, ladder climbs, and various dog-andpony tricks. Puppy Palace has about 16 dogs and a list of 50 tricks from which to choose. Each dog can perform one or more tricks, and many tricks can be performed by more than one dog. When a dog learns a new trick, the trainer assigns a skill level. Some customers insist on using dogs that score a 10, which is the highest skill level. As an IT consultant, you have been asked to suggest 3NF table designs. You are fairly certain that a M:N relationship exists between dogs and tricks. 1. Draw an ERD for the Puppy Palace information system. 2. Indicate cardinality. 3. Identify all fields you plan to include in the dogs and tricks tables. For example, in the dogs table, you might want breed, size, age, name, and so on. In the tricks table, you might want the trick name and description...

Pick and Shovel Construction Company Situation: Pick and Shovel Construction Company is a multistate building contractor specializing in medium-priced town homes. C. T. Scott, the owner, is in your office for the third time today to see how the new relational database project is coming along. Unfortunately, someone mentioned to C. T. that the delay had something to do with achieving normalization. “Why is all this normalization stuff so important?” he asks. “The old system worked OK most of the time, and now you are telling me that we need all these special rules. Why is this necessary?” 1. How should you respond to C. T.? Write him a brief memo with your views.   Normalization reduces data duplication, databases can hold a significant amount of information, perhaps millions or billions of pieces of data. Normalizing a database reduces its size and prevents data duplication. It ensures that each piece of data is stored only once. Normalization is important to devel...