Conference Management System
Users
ID
name
school
password
gender
avatar
User Roles
user ID
Conference ID
Role
0. owner (Creator)
1. committee memeber
2.dais memeber
3. delegate
Conferences
ID
name
startTime
endTime
location
topic(optional)
application URL
application guide URL
QQ group #
owner (→ user id)
payment
Committe
Subtopic