06 Jan FIGURE P1.1 The File Structure for Problems 1-4
FIGURE P1.1 The File Structure for Problems 1-4
1. How many records does the file contain? How many fields are there per record?
2. What problem would you encounter if you wanted to produce a listing by city? How would you solve this problem by altering the file structure?
3. If you wanted to produce a listing of the file contents by last name, area code, city, state, or zip code, how would you alter the file structure?
4. What data redundancies do you detect? How could those redundancies lead to anomalies?
Using Figure P2.4 as your guide, work Problems 4–5. The DealCo relational diagram shows the initial entities and attributes for the DealCo stores, located in two regions of the country.
Figure P2.4 The DealCo relational diagram
4.Identify each relationship type and write all of the business rules.
5. Create the basic Crow’s Foot ERD for DealCo.
Use the database shown in Figure P3.17 to answer Problems 17-23.
FIGURE P3.17 The Ch03_TransCo Database Tables
17. For each table, identify the primary key and the foreign key(s). If a table does not have a foreign key, write None.
18. Do the tables exhibit entity integrity? Answer yes or no and then explain your answer.
19. Do the tables exhibit referential integrity? Answer yes or no and then explain your answer. Write NA (Not Applicable) if the table does not have a foreign key.
20. Identify the TRUCK table’s candidate key(s).
21. For each table, identify a superkey and a secondary key.
22. Create the ERD for this database.
23. Create the relational diagram for this database.
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