2. SCENARIO
Private is a new company that sells used cars. They also provide after-
sales servicing and repairs. They operate at three sites - Disley, Stanton
and Denton.
You have been engaged by the company to introduce the use of a
database to help them to run the business. They have details of the
vehicles for sale and of prospective buyers - people who have made
enquiries and are waiting for a particular type of vehicle. The database
must be set up to store the vehicle details, and enable the sales staff to
search it for specific vehicles and features.
You must produce a complete design for a working relational database
that will contain at least three tables and 60 records.

3. OBJECTIVES:
Understand the requirements for Unit 6
Be able to build DFDs
Demonstrate a high quality DFD to different
levels of complexity

4. OBJECTIVE: BE ABLE TO EXPLAIN THE
REQUIREMENTS FOR UNIT 6
For Unit 4 you need to create your own high
quality relational database.
8AOs:
• AO1 - Design a relational database to meet the needs of an organisation
• AO2 - Produce the database according to the design
• AO3 - Interrogate the database
• AO4 - Create a user interface
• AO5 - Produce Reports
• AO6 - Produce user documentation and technical information
• AO7 - Test the database
• AO8 - Evaluate the database

5. OBJECTIVE: UNDERSTAND DFDS
What is a Data Flow Diagram (DFD)?

6. OBJECTIVE: UNDERSTAND DFDS
Symbols and their meaning
Process: -
A process transforms incoming data flow into outgoing data flow.

7. UNDERSTAND DFDS
DataStore
Datastores are repositories of data in the system. They are sometimes also
referred to as files.

8. OBJECTIVE: UNDERSTAND DFDS
Dataflow
Dataflows are pipelines through which packets of information flow. Label
the arrows with the name of the data that moves through it.

9. OBJECTIVE: UNDERSTAND DFDS
External Entity
External entities are objects outside the system, with which the system
communicates. External entities are sources and destinations of the
system's inputs and outputs.

10. EXAMPLE DFD LEVEL 0

11. MINI-PLENARY: - MAKE A DFD
Using what you have just learnt, create a Level 0 DFD for the following: -
CD Borrowing system
Data to process: -
 Borrower information
 Item Data
Storage Entity
Borrower File
Record File

12. ACTIVITY 2
Objective: -Demonstrate a high quality
DFD to different levels of complexity
Start planning your databases and
preparing your Data Flow Diagrams

13. PLENARY
Talk to amongst your selves to review
the DFDs created support each other
in missing components