IPT Year 12 how to design database
13
IPT YEAR 12 RELATIONAL DATABASE How to create a conceptual schema (CS) diagram using NIAM steps with an example ‘problem’ Mrs. Schneider May 2012
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Transcript of IPT Year 12 how to design database
IPT YEAR 12
RELATIONAL DATABASE
How to create a conceptual schema (CS) diagram using
NIAM steps with an example ‘problem’
Mrs. Schneider
May 2012
NIAM STEPS
1. State the elementary facts
2. Draw the first draft conceptual schema (CS) diagram.
3. Remove surplus entities and indicate derived facts.
4. Add uniqueness constraints
5. Add mandatory roles and cardinality constraints
6. Check that conceptual schema can be populated by examples given
BUSINESS ‘PROBLEM’
Nurture Nursery
specializes in native
plants. The business
requires a computerised
system that includes
functionality for
inventory control and
production of
identification tags.
PLANT DATA
For each plant the system will need to store:
biological name
common name
maximum growth height in metres
colour of flowers
the time of year for flowering
picture of the plant.
The identification tags will need to carry all this information.
MORE INFORMATION
The plants are sold in four pot sizes (1 to 4), which have a corresponding retail price ($4, $5, $6, $8). The number of each plant in each pot size will also need to be stored.
The nursery requires a simple way of updating stock numbers when plants are sold or stock replenished. The new stock most often comes in orders of a particular plant, but the business sometimes replenishes all stock by ordering a set quantity of all No. 1 size pots.
STATE THE ELEMENTARY FACTS
Plant with Biological name
Has
Common Name of
Plant with Biological name
Has
Maximum Height with metres
Plant with Biological name
Has
Flower Colour with description
Plant with Biological name
Has
Flowering Time with description
Plant with Biological name
Has
Appearance described by the picture
Plant with Biological name
Is in
Pot Size with number
Combination (Plant – Pot Size)
Has
Quantity in Stock with number
Combination (Plant – Pot Size)
Has
Total Value with $
Pot Size with number
Has
Price with $
DRAW THE DRAFT CONCEPTUAL SCHEMA
ADD UNIQUENESS CONSTRAINTS & MANDATORY
ROLES
DRAW LOOPS AROUND THE ROLES
OPTIMAL NORMAL FORM
ESTABLISH TABLES
RELATIONAL SCHEMA
WHAT IS NEXT IN THIS PROCESS?
After creating the conceptual schema you
would
start to create table definitions (planning how you
will create the tables)
Draw draft forms (interfaces)
Possibly create an information flow diagram
Create the database within Access, Oracle etc.
