Question

I need an Entity Relationship Diagram (ERD) drawn (table names and Primary Key with relationships) with LucidChart of a similar tool from the following text:

"A teacher wants to track student performance in his class. The class can have 2 or more students and the student performance in graded activities is captured to determine the students' final grade.:

I need the optional/mandatory parts of the relationship captured as well as the diagram annotated with the assumptions you are making to support the ERD.

Answer 1

In an Entity Relationship Diagram (ERD) for tracking student performance in a class, there are entities such as Teacher, Class, Student, and Graded Activity. The relationships include one-to-many relationships between Teacher and Class, Class and Student, and Class and Graded Activity. The optional and mandatory parts of the relationships are also captured in the ERD.

Step-by-step explanation:

The Entity Relationship Diagram (ERD) for tracking student performance in a class can be represented as follows:

Entities:

• Teacher (Primary Key: Teacher ID)
• Class (Primary Key: Class ID, Foreign Key: Teacher ID)
• Student (Primary Key: Student ID)
• Graded Activity (Primary Key: Activity ID, Foreign Keys: Class ID, Student ID)

Relationships:

• A class can have multiple students, so there is a one-to-many relationship between Class and Student.
• A teacher can teach multiple classes, so there is a one-to-many relationship between Teacher and Class.
• Graded activities are associated with a specific class and student, so there is a one-to-many relationship between Class and Graded Activity, and a one-to-many relationship between Student and Graded Activity.

Optional/Mandatory Parts:

• The relationships between Teacher and Class, and between Class and Student are mandatory, as each class must have a teacher and each student must be enrolled in a class.
• The relationship between Class and Graded Activity is mandatory, as every class must have graded activities.
• The relationship between Student and Graded Activity is optional, as a student may not have any graded activities if they are not participating in any.

Assumptions:

• It is assumed that each student is uniquely identified by a Student ID, and each teacher is uniquely identified by a Teacher ID.
• It is assumed that each class is uniquely identified by a Class ID, and that a Class ID is associated with a specific teacher.
• It is assumed that each graded activity is uniquely identified by an Activity ID, and that an Activity ID is associated with a specific class and student.