Strcture

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Conference Management System

Committe

Subtopic

Conferences

payment

owner (→ user id)

QQ group #

application guide URL

application URL

topic(optional)

location

endTime

startTime

User Roles

Role

3. delegate

2.dais memeber

1. committee memeber

0. owner (Creator)

Conference ID

user ID

Users

avatar

gender

email

password

school

name

ID