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Draw a simple ERD (Entity-Relationship Diagram) for the following example. Include proper maximum and minimum cardinality and one attribute besides keys.

a. Sandy’s Car Lot has several salesmen who sell a variety of used automobiles to customers. When sold, each automobile is credited (sold by) to only one salesperson. A customer may buy more than one automobile, but an automobile, if sold, is sold to only one customer.

Answer :

Final answer:

An Entity-Relationship Diagram (ERD) for Sandy’s Car Lot would include three entities: Salesperson, Customer, and Automobile. The relationships would be as follows: Each Salesperson can be associated with many Automobiles (one-to-many), each Automobile is associated with only one Salesperson (one-to-one), each Customer can buy multiple Automobiles (one-to-many), and each Automobile is bought by only one Customer (one-to-one).

Figure:

[Figure: ERD for Sandy’s Car Lot]

[Salesperson] --- (1:M) --- [Automobile]

[Customer] --- (1:M) --- [Automobile]

Explanation:

This ERD effectively captures the relationships between the entities in Sandy’s Car Lot. Each entity is represented by a rectangle, and the relationships between entities are depicted using lines connecting them. The Salesperson entity has a one-to-many relationship with the Automobile entity, denoted by the line connecting Salesperson to Automobile with a crow's foot symbol at the Salesperson end indicating "many" and a straight line at the Automobile end indicating "one". This reflects the fact that one Salesperson can sell multiple Automobiles, but each Automobile is sold by only one Salesperson. Similarly, the Customer entity has a one-to-many relationship with the Automobile entity, indicating that one Customer can buy multiple Automobiles, but each Automobile is bought by only one Customer.

Including proper maximum and minimum cardinality ensures clarity in the relationships between entities. In this case, the maximum cardinality for both relationships is "many" as multiple Automobiles can be associated with one Salesperson or bought by one Customer. The minimum cardinality for the Salesperson to Automobile relationship is "one" as each Automobile must be sold by at least one Salesperson, while the minimum cardinality for the Customer to Automobile relationship is also "one" as each Automobile must be bought by at least one Customer. This ERD provides a clear visual representation of the essential elements of Sandy’s Car Lot's business model.

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