== Application Design – Use Cases and Database Access Scenarios – SQL Views

== Actors

**Guest User (Unauthenticated User)**
   
  A user who does not have an active session. Can access only public information such as the list of courses and categories.
  

**Registered User (USER)**

  A logged-in user. Can purchase subscriptions, enroll in courses, watch lessons, take quizzes, and receive certificates.


**Instructor (INSTRUCTOR)**

  A privileged user who creates and manages courses, modules, and lessons, and can review enrolled students’ progress.

**Administrator (ADMIN)**

  A user with full privileges who manages support tickets and oversees platform operations.

== Scenarios

[wiki:UserLogin User Login]

[wiki:NewUserRegistration New User Registration]

[wiki:PurchasingSubscription Purchasing a Subscription]

[wiki:ViewingAvailableCourses Viewing Available Courses (Public Access)]

[wiki:EnrollingCourse Enrolling in a Course]

[wiki:ClientRegistration Client Registration]

[wiki:WatchingLessons Watching Lessons and Taking a Quiz]

[wiki:IssuingCertificate Issuing a Certificate]

[wiki:CreatingCourse Creating a Course (Instructor)]

[wiki:AddingModules Adding Modules and Lessons (Instructor)]

[wiki:ViewingEnrolledStudents Viewing Enrolled Students per Course (Instructor)]

[wiki:SupportTickets Support Tickets (Admin)]

[wiki:ViewingAllSupportTickets Viewing All Support Tickets (Admin)]

== Most Important Use Cases

[wiki:NewUserRegistration New User Registration]

[wiki:PurchasingSubscription Purchasing a Subscription]

[wiki:ViewingAvailableCourses Viewing Available Courses (Public Access)]

[wiki:EnrollingCourse Enrolling in a Course]

[wiki:WatchingLessons Watching Lessons and Taking a Quiz]

[wiki:CreatingCourse Creating a Course (Instructor)]

[wiki:SupportTickets Support Tickets (Admin)]