Assignment Task

Questions

1. Develop an ER diagram for a restaurant management system, showcasing at least 4 entities, their relationships, cardinalities, and specialization/generalization.

2. Explain the key differences between Data Definition Language (DDL) and Data Manipulation Language (DML) commands. Provide examples of each type of command and elucidate their roles in database administration and data analysis.

3. Utilizing relational database tables "Orders" and "Customers," compose an SQL query to execute an inner join, extracting details about customers who have placed orders.

4. Given a scenario with a MySQL database containing sales data, construct an SQL query to compute the total sales revenue for a specific product category within a designated time period. Elaborate on the query`s logic.

5. In a bookstore database with a "Books" table including book_id, title, author, and price columns, craft an SQL query to retrieve titles and prices of books authored by "John Doe" priced above $20.

6. For a school database featuring a "Students" table with student_id, student_name, grade, and age columns, formulate an SQL query to retrieve names and ages of students in the 9th grade older than 15 years.

Database Design

• Create a database named "Hospital" and design the following tables:

  • Doctors (doctor_id, doctor_name, specialty)
  • Patients (patient_id, patient_name, age, gender)
  • Appointments (appointment_id, doctor_id, patient_id, appointment_date)

SQL Tasks

• Write SQL statements to create the specified tables and establish necessary relationships.

• Develop SQL queries to perform the following tasks:

  • Retrieve names of all doctors specializing in Cardiology.
  • Calculate the average age of all patients.
  • Delete all past appointments from the "Appointments" table based on appointment date.

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