Draw an ER diagram for the three tables: Customer, Employee, and Sales Order.
Suppose the Sales Order Table also contains information for an employee who makes a sale. If you have an ERD drawing tool such as Visio, you could draw the diagram using the tool and copy it into your document. You could also draw it on paper, scan it, and insert it into your document. If you cant do either of the above, you could write down the table schemata and describe the relationships among them.
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