Linking Database Tables
Database Management System
Database Life Cycle
DBLC Design Stages
3 Schema Architecture
Post Design Stages
Application Approach DB Design
Database Design Strategy
Business Rules Importance
Customer Order Shipment
Define Business Objects
Data Flow Diagram
Interview Data Users
Attributes and Entities
Entities Conceptual Model
Store Entity Values
Attribute Domains Types
Rules for Creating Identifiers
Three Relationship Types
Convert m:n to 1:n
One to One Relationships
Optional Participation Relationships
Mandatory Optional Relationship
Student Class Entities
Calculate Table Fields - Exercise
Compose a list of calculated fields.
This exercise is worth a total of 20 points. You will receive up to five points for each correctly submitted calculation according to the instructions below.
In the preceding lesson, you learned that the base tables stored in a database cannot have calculations built into their fields. Instead, user views and database applications are created to perform calculations on data. User views are stored queries that deliver specified data from base tables into virtual tables that allow calculations to be performed. The key, then, is to determine what calculations to include in user views so that data is transformed into useful information for an organization’s decision-makers.
This exercise requires you to download (if you have not already done so) the sample case study available from the following link:
ERD Case Study
Carefully read the Stories on CD, Inc. case study and list four calculations that would transform the company's stored data into useful information for running the business. Do not be concerned with creating user views, just imagine; user views with the calculated fields you provide included in them.
Approach this exercise as though you were Ted or Lisa: what information would you, as an owner, consider useful in making business decisions?
are those who
like users and producers of data. If you can combine
with database design skills, you will always have opportunities come your way.
Submitting your exercise
Type or paste your answers into the text box below, then click
to submit them and view a results page.