Applying Peter Chen$$s Notation to Your Schema

Here$$s how the ERD would look based on your schema:

Entities:

Users: Attributes $-$ user$\_$id $($PK$),$ first$\_$name, last$\_$name, password, role, department, club, email.Clubs: Attributes $-$ club$\_$id $($PK$),$ club$\_$name, description, created$\_$date.Memberships: Attributes $-$ membership$\_$id $($PK$),$ user$\_$id $($FK$),$ club$\_$id $($FK$),$ join$\_$date.Events: Attributes $-$ event$\_$id $($PK$),$ event$\_$name, description, date, club$\_$id $($FK$).$Votes: Attributes $-$ vote$\_$id $($PK$),$ user$\_$id $($FK$),$ club$\_$id $($FK$),$ candidate$\_$id $($FK$),$ vote$\_$date.Message: Attributes $-$ message$\_$id $($PK$),$ sender$\_$id $($FK$),$ receiver$\_$id $($FK$),$ content, sent$\_$date.

Relationships:

Users to Memberships: A one$-$to$-$many relationship, as a user can belong to multiple clubs.Clubs to Memberships: A one$-$to$-$many relationship, as a club can have multiple users.Clubs to Events: A one$-$to$-$many relationship, as a club can organize multiple events.Users to Votes: A one$-$to$-$many relationship, as a user can vote for multiple candidates within a club.Clubs to Votes: A one$-$to$-$many relationship, as a club can have multiple votes.Users to Messages: A many$-$to$-$many relationship, as users can send messages to each other.