ER modeling

Doc/ER_diagram.md

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+# This diagram represents the ER relationship diagram among the entities below
+
+# In order to understand the cardinality, please refer to the mermaid documentation
+
+# https://mermaid-js.github.io/mermaid/#/entityRelationshipDiagram
+
+```mermaid
+  erDiagram
+          USER ||--|| STUDENT : is
+          USER ||--|| MENTOR : is
+          USER ||--|| ADMIN : is
+          USER ||--|| SIGNIN : has
+          STUDENT ||--o{ EVENTS : posts
+          STUDENT ||--|| CALENDAR : has
+          MENTOR ||--|| CALENDAR : has
+          MENTOR ||--|{ WEEKDAYS : tutors
+          ADMIN ||--o{ EVENTS : posts
+          CALENDAR ||--|{ WEEKDAYS: has
+        USER {
+            int user_id PK
+            string fullName
+            string Jnumber
+            string email
+            string role
+            string userName
+        }
+        STUDENT {
+            int student_id PK
+            string user_id FK
+        }
+        MENTOR {
+            int mentor_id PK
+            string user_id FK
+            string course
+        }
+        ADMIN {
+             int admin_id PK
+             string user_id FK
+        }
+        SIGNIN {
+            int signIn_id PK
+            string user_id FK
+            string userName
+            string password
+        }
+        EVENTS {
+            int events_id PK
+            string mentor_id FK
+            string student_id FK
+            dateFormat startDate
+            dateFormat endDate
+        }
+        CALENDAR {
+            int calendar_id PK
+            int weekday_id FK
+        }
+        WEEKDAYS {
+            int weekday_id PK
+            int mentor_id FK
+            dateFormat startDate
+            dateFormat endDate
+        }
+```