E-R Modeling

A company needs to maintain information about sales representatives, sales areas, and products. Each representative is responsible for sales in one or more areas. Each area has one or more responsible representatives. Similarly, each representative is responsible for sales of one or more products and each product has one or more responsible representatives. Every product is sold in every area. After a new product is added to the inventory, the sales reps are trained to sell the product.

Specify an entity-relationship diagram for this database. Don't forget to underline key attributes and include cardinality ratio and participation constraints for the relationships. Specify any assumptions you make. You can limit yourself to 7 attributes per entity.