SSD7 Skill Builder 3：ER Modeling A,B,C

Entities: 1.Doctor Doctor_Id (PK) Name Office_Number Office_Phone_Number 2.Patient Patient_Id (PK) Name Home_Address Phone_Number 3.Illness Name (PK) 4.Medication Name (PK) Interactions_with_other_Medications Relationships: 1.has: <Patient, Illness>, M:N, total/partial; 2.treat: <Doctor, Patient>, M:N, partial/total; 3.use: <Patient, Medication>, M:N, total/partial; 4.prescribe: <Doctor, Medication>, 1:N, partial/total.