Question

Draw an ERD for CarShop in IDEF1x format.

Include all applicable entities and relationships. Indicate primary keys and attributes for all entities. Include all ordinalities and cardinalities.

Answer 1

An ERD in IDEF1x format for CarShop would feature entities like Cars, Customers, and Sales, with primary keys identified for each. Relationships with respective cardinalities and ordinalities would be depicted to show the connections between entities such as Cars to Sales and Customers to Sales.

Step-by-step explanation:

Creating an Entity-Relationship Diagram (ERD) in IDEF1x format involves identifying the entities, their attributes, and the relationships between them. For the CarShop example, the ERD would involve several entities such as Cars, Customers, Sales, and Employees.

The Cars entity would likely have attributes including a Car_ID (primary key), Make, Model, and Year. Customers might include Customer_ID (primary key), Name, and Contact Information. The Sales entity would link Cars and Customers and may include attributes like Sale_ID (primary key), Sale_Date, and Car_ID, Customer_ID as foreign keys.

In terms of relationships, a one-to-many relationship might exist between Cars and Sales (one car can be involved in multiple sales), while a many-to-one relationship might relate Customers to Sales (a customer can make many purchases). Each relationship would be annotated with cardinalities, such as '1:N' for one-to-many and 'N:1' for many-to-one, and ordinalities (optional or mandatory participation).