Chapter 9
Apply Your Knowledge
April 9,2018
A. 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?”
Question:
1. How should you respond to C. T.? Write him a brief memo with your views.
Answer:
Normalization is extremely vital for it's a method of avoiding issues in knowledge style. Also, it's a method of reducing redundancy and multivalued fields. decide and Shovel Construction Company would offer on-line group action process wherever knowledge modification occur often in a very information.
2. Assume that the Pick and Shovel’s main entities are its customers, employees, projects, and equipment. A customer can hire the company for more than one project, and employees sometimes work on more than one project at a time. Equipment, however, is assigned only to one project. Draw an ERD showing those entities.
3. Add cardinality notation to your ERD.
4. Create 3NF table designs.
- this table shows that we've already satisfy both 1NF and 2NF
- Projcode and Equipment are both eliminated because they are not dependent on our primary key
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