---

erDiagram
    STUDENT ||--o{ ENROLLMENT : "регистрируется"
    COURSE ||--o{ ENROLLMENT : "включает"

    STUDENT {
        int id PK
        string full_name
        string email
        string register_date
    }
    COURSE {
        int id PK
        string programming_language
        string difficulty_level
        int duration_hours
    }
    ENROLLMENT {
        int id PK
        int student_id FK
        int course_id FK
        int progress_percent
    }