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A hospital inpatient section has several departments. Each department has several doctors and manages several wards, and the department has attributes of Department_id, Department_name, Department_manager.

A hospital inpatient section has several departments. Each department has several doctors and manages several wards, and the department has attributes of Department_id, Department_name, Department_manager. A patient has the attribute of P_id, P_name, Entrance_date. A doctor has the attribute of Doctor_id, Doctor_name, Doctor_department. Each ward has the Ward_id, Ward_location, Ward_totalcapacity, Ward_freecapacity. A patient stays in one ward and is treated by one doctor. A doctor belongs to one department. Each ward belongs to one department and holds several patients. A patient is treated by a doctor, a doctor can treat several patients. According to the descriptions above, please finish the following questions:

1) Design the Entity-Relationship diagram to represent department, doctor, patient, ward and their relationship.

2) Change the ER model into the relational model. Also identify the primary and foreign key in schemas.

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