= UseCase3001Implementation – Enroll in Subject

**Initiating actor:** Student

**Other actors:** None

**Description:** Student enrolls in a subject offered by their faculty.

**Scenario:**

1. System displays Student Menu.

2. Student selects Enroll in Subject.

3. System lists students → selects student ID.

4. System lists available subjects → selects subject.

5. System checks enrollment:
{{{
SELECT * FROM Student_Subject WHERE Student_Id = ? AND Subject_Id = ?;
}}}

6. If not enrolled, system inserts:
{{{
INSERT INTO Student_Subject(Student_Id, Subject_Id, Status, Enrollment_Date)
VALUES (?, ?, 'ENROLLED', CURRENT_DATE);
}}}

7. System confirms enrollment.
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