PUG Computer Science Physical Model for A Database Design Diagram

Instructions

Complete the physical model for your database design. This model will be based upon the logical model you created previously. Developing your physical model will require that you carefully document the definitions for your database that you will later implement in the database management system, Microsoft Access.

Think carefully about the type of data you will be storing in each field.

Will it be numeric?

Will it be text?

Can it be left blank (null)?

Refer to the file

IT163_Example3

for a demonstration.

You will use Microsoft Visio to build your physical ERD diagram which will include the following.

You may start with your existing logical diagram and modify it as follows:

As an additional challenge for this phase of the design, you will add one more table to the database design. Think of some other aspect of this business model that you could bring into the design at this point. You must plan out how this new table will relate to at least one other existing entity. Show the relationship using crows foot style of notation.

Table names. Include those from your conceptual diagram and the new table from the previous step. Remember to use meaningful names and consistent naming conventions.

Hint: these started out as entities

Field names. Identify appropriate field names for each table in your diagram. Remember to use consistent naming conventions. (i.e. clientID, petID, breedID might all be primary key fields).

Hint: these started out as your attributes

Reference:

http://www.databasedev.co.uk/database_field_names.html

Primary keys/foreign keys. Notate the primary and foreign keys in each table as applicable. Remember to be consistent.

Hint: the primary key in the “one” table matches to the foreign key in the related table.

Reference:

Access 2019 for Dummies.Chapter 5: “Table Tune Ups/The Primary Key to Success”

Data types and field sizes. Identify appropriate data types for each field and field sizes as applicable.

Hint: right-click your entity block and choose show attribute types to add a column to the right of your field names.

Reference: Access 2019 for Dummies.Chapter 4: “Sounds Like a Plan / Determining Data Types”

Nullability. Identify those fields that can be left blank.

Hint: You may simply identify those fields that may be left blank with a null indicator as shown in the example.

For extra help see Optional Resources for Assignment under the Academic Tools, Library link:

Reference: Oppel, Andy. (2010). Data modeling: a beginner’s guide. McGraw-Hill/Osborne.

Chapter 8: “Physical Database Design / Integrating Business Rules and Data Integrity”