An Online Hospital Appointment Management System can be designed using a relational DBMS such as MySQL, PostgreSQL, or Oracle. The main purpose of the system is to store and manage information about patients, doctors, appointments, departments, and payments in an organized manner. The system demonstrates important DBMS concepts such as database design, entity relationships, primary and foreign keys, CRUD operations, and SQL queries for retrieval and analysis. The database can be named `hospital_appointment`. The major entities are Patient, Doctor, Department, Appointment, and Payment. The Patient entity stores patient details such as Patient_ID, Name, Date_of_Birth, Gender, Phone, Email, and Address. The Doctor entity contains Doctor_ID, Name, Specialization, Phone, Email, and Department_ID. The Department entity stores Department_ID and Department_Name. The Appointment entity contains Appointment_ID, Patient_ID, Doctor_ID, Appointment_Date, Appointment_Time, Status, and Reason. The Payment entity stores Payment_ID, Appointment_ID, Amount, Payment_Date, and Payment_Status. The relationships between these entities are established using primary and foreign keys. Patient_ID is the primary key of the Patient table and is used as a foreign key in the Appointment table. Similarly, Doctor_ID is the primary key of the Doctor table and is referenced by Appointment. Department_ID connects Doctor with Department. Appointment_ID connects Payment with Appointment. Thus, one patient can have many appointments, one doctor can have many appointments, and one department can have many doctors. These relationships