database - Can a entity be a attribute of a relationship in an ER diagram? -


An assignment was given to draw an ER drawing and convert it to SQL Working, but I have trouble. My problem is more about cleanliness, I am using the evening method and the assignment specifies that I have a unit of almost every unit. To wit. "3. Employees are in charge of many tasks: sell music to customers." Now these three organizations are employees, customers and music. I was wondering if it would be acceptable to connect the employee and the customer with the sales relationship, then there is a connecting feature to sell music, while I still have a connecting feature in the picture I am making a music unit. Apart from this, two of these are acceptable to the same institutions, I think using an organization loses twice for the purpose of drawing? When I coding, I think I can use only one indicator, so my question is, is it also acceptable in the ER diagram?

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