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
Business Rules - Exercise
Identify business rules and constraints.
This exercise is worth a total of 15 points. You will receive up to five points for each correctly described constraint matching the business rules outlined below, and up to an additional five points for a correctly described business rule matching the constraint outlined below.
In the preceding lesson, you learned that many (not all) business rules can be imposed on the logical schema by the database designer, who places
on table fields and relationships between tables to force business rules to be honored. These constraints are then enforced by the RDBMS.
By examining the existing database(s), you may be able to “spot” constraints already in place and work backwards to the business rule from which it was derived. But, more commonly, you are apprised of business rules, and must create the constraints yourself.
Below are two business rules and one constraint. For each business rule, compose a single sentence that
describes the constraint you would impose.
(A sentence might read something like this: Place a (relationship or field) constraint on ….)
For the constraint, compose a single sentence that posits the probable business rule.
Business rule: No
customer order may be less than $1.00 or exceed $500.00.
Business rule: No high-school instructor can sponsor more than two student committees.
Constraint: Only MasterCard, VISA, and Discover button options appear on an order form.
Submitting your exercise
Type or paste your answers into the text box below, then click
to submit them and view a results page.