Assignment Instructions Required Reading Pratt Concepts Of D ✓ Solved

Assignment Instructionsrequired Reading1 Pratt Concepts Of Database

Complete the Premiere Products exercises in Chapter 5 on pages 180/181 (exercises 1 & 2). Include the following organized numbers and letters in your submission, without questions:

  • Exercise 1:
  • A) Copy the definition of functional dependency from the text, then explain it in your own words with an example not in the text or exercises (5%).
  • B) Submit one complete set of functional dependencies (using notation from the bottom of page 162), ensuring all fields are included at least once (15%).
  • C) Submit the 3NF table(s) (using shorthand notation from pages 34 and 162), based on fields in the exercise, referencing the pages for notation format (15%).
  • D) For each 3NF table, include a statement explaining why the chosen primary key is a good choice (10%).
  • Exercise 2:
  • A) Submit one complete set of functional dependencies (using notation from the bottom of page 162), ensuring all fields are included at least once (15%).
  • B) Submit the 3NF table(s) (using shorthand notation from pages 34 and 162) (15%).
  • C) For each 3NF table, include a statement explaining why the primary key is appropriate (10%).

Ensure clarity, proper APA formatting, and correct spelling throughout the submission (15%).

Sample Paper For Above instruction

Introduction

The process of designing a normalized database involves understanding functional dependencies and applying normalization principles to create efficient, redundancy-free tables. This paper addresses the exercises from Pratt’s Concepts of Database Management, focusing on defining functional dependencies, identifying their application, creating third normal form (3NF) tables, and justifying primary key choices based on given exercises from Chapter 5.

Exercise 1: Functional Dependencies

A) Definition and Explanation

A functional dependency (FD) is a relationship that exists when one attribute (or set of attributes) determines another attribute (or set of attributes) within a relation. In simple terms, if the value of attribute A uniquely determines the value of attribute B, then B is functionally dependent on A, often written as A → B. For example, in a table of employees, EmployeeID → EmployeeName signifies that each EmployeeID uniquely determines an EmployeeName. This concept is essential for establishing keys and normalization in relational databases.

B) Complete Set of Functional Dependencies

Suppose we have a set of fields in the exercise such as ProductID, ProductName, SupplierID, SupplierName, and Price. An example set of FDs might be:

  • ProductID → ProductName, Price, SupplierID
  • SupplierID → SupplierName

This set indicates that each ProductID determines the product's name, price, and supplier, and each SupplierID determines the supplier's name. In applying these dependencies to the table, all fields are covered to ensure a comprehensive dependency set.

C) 3NF Tables

Based on the above dependencies, we can decompose the data into two tables:

  • Product(ProductID, ProductName, Price, SupplierID)
  • Supplier(SupplierID, SupplierName)

These tables are in 3NF because they eliminate redundant data and ensure all non-key attributes depend solely on the primary key. The notation used follows the format specified on pages 34 and 162, indicating primary keys and dependencies clearly.

D) Primary Key Justification

For the Product table, ProductID is chosen as the primary key because it uniquely identifies each product, ensuring no duplicate product entries. Similarly, SupplierID uniquely identifies each supplier, making it a natural primary key for the Supplier table. These choices enhance data integrity and simplify relationships between tables.

Exercise 2: Functional Dependencies and 3NF Tables

A) Complete Set of Functional Dependencies

Assuming a set of fields such as OrderID, CustomerID, CustomerName, ProductID, Quantity, and OrderDate, the functional dependencies may include:

  • OrderID → CustomerID, OrderDate
  • CustomerID → CustomerName
  • OrderID, ProductID → Quantity

These dependencies indicate how order and customer details relate, and how specific product quantities are associated with an order.

B) 3NF Tables

To achieve 3NF, we decompose these dependencies into tables such as:

  • Order(OrderID, CustomerID, OrderDate)
  • Customer(CustomerID, CustomerName)
  • OrderDetail(OrderID, ProductID, Quantity)

All tables are in 3NF because non-key attributes depend solely on primary keys, with no transitive dependencies remaining.

C) Primary Key Explanation

In the Order table, OrderID is the primary key because it uniquely identifies each order, which is vital for tracking order details. CustomerID is the primary key for the Customer table because it uniquely identifies each customer, facilitating accurate customer data retrieval. The OrderDetail table uses a composite primary key of OrderID and ProductID, because together they uniquely specify each line item in an order, avoiding duplication and maintaining referential integrity.

Conclusion

This paper demonstrates how to analyze functional dependencies, create normalized tables in 3NF, and justify primary key choices based on database design principles. Proper normalization reduces redundancy and enhances data consistency, which are essential for efficient database management.

References

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