Database Design to do task, Define your entities and attributes and the relations that exist between them

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Based on your selected scenario from Hands-On Database, complete the “To Do” activities described at the end of Chapter 4 of the textbook.

Grandfield College A team from the Software Alliance could show up any day. The IT services manager is eager to get the tracking database in place. It is time to show some progress. Create the logical design of the database following these steps:

To do

  1. Review all the requirements and business rules.
  2. Define your entities and attributes and the relations that exist between them. Create a logical model using crow’s feet notation in Visio or hand draw it on graph paper if you prefer.
  3. Add all the entities and their attributes. You don’t need to worry about data types for now. Identify the key fields for each entity and the foreign keys.
  4. Analyze the diagram. Identify which role (i.e., domain, linking, lookup, or weak) each entity plays in your database. Review it for the following: Are all the major components of the software tracking system represented by domain entities? Does each entity contain the appropriate attributes to fully describe it and meet the business rules you have gathered so far? Does every entity have an appropriate primary key defined? Are all many-to-many relationships resolved into one-to-many relationships by linking tables? Are the relationships valid (no cross relationships)? Is the appropriate entity is defined as the one side of a one-to-many relationship? Do the tables have appropriate foreign keys? Also check for other such issues. Are lookup tables used for attributes that have a set list of values? Documentation: Be sure to store your ERDs in your database notebook.

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