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Here we are going to design an Entity Relationship (ER) model for a college database.Say we have the following statements.1. A college contains many departments 2. Each department can offer any number of courses 3. Many instructors can work in a department 4. An instructor can work only in one department 5. For each department there is a Head 6. An instructor can be head of only one department 7. Each instructor can take any number of courses 8. A course can be taken by only one instructor9. A student can enroll for any number of courses 10. Each course can have any number of students From the statements given, the entities are

Question

Here we are going to design an Entity Relationship (ER) model for a college database.Say we have the following statements.1. A college contains many departments 2. Each department can offer any number of courses 3. Many instructors can work in a department 4. An instructor can work only in one department 5. For each department there is a Head 6. An instructor can be head of only one department 7. Each instructor can take any number of courses 8. A course can be taken by only one instructor9. A student can enroll for any number of courses 10. Each course can have any number of students From the statements given, the entities are

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Solution

The entities in the given statements for designing an Entity Relationship (ER) model for a college database are:

  1. College
  2. Department
  3. Course
  4. Instructor
  5. Student

Now, let's define the relationships between these entities:

  1. A College contains many Departments (One-to-Many relationship between College and Department)
  2. Each Department can offer any number of Courses (One-to-Many relationship between Department and Course)
  3. Many Instructors can work in a Department (Many-to-One relationship between Instructor and Department)
  4. An Instructor can work only in one Department (One-to-One relationship between Instructor and Department)
  5. For each Department there is a Head (One-to-One relationship between Department and Instructor)
  6. An Instructor can be head of only one Department (One-to-One relationship between Instructor and Department)
  7. Each Instructor can take any number of Courses (One-to-Many relationship between Instructor and Course)
  8. A Course can be taken by only one Instructor (

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