In Chapter 4, you developed a domain model class diagram. Using your previous solution or one provided to you by your instructor, update your domain model class diagram with any additional problem domain classes, new associations, or additional attributes that you have discovered as you worked through the previous chapters. Finalize this comprehensive domain model and then turn it in as part of your solution. 

Using this comprehensive domain model class diagram, develop a relational database schema. In the schema, identify the foreign keys that are required. Also, identify a key attribute for each table. You may need to add a key field if there isn’t an attribute that could logically serve as the key. Remember that a candidate key for an association class is the combination of the keys of the connected classes. However, it may make sense to define a shorter, more concise key field. 

Verify that each table is in first, second, and third normal form. Discuss any discrepancies you had to fix from your first solution. Discuss any tables that may not be in third normal form and why you are leaving it as not-normalized.