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ER diagram and a Relational Schema

  1. Sep 9, 2009 #1
    I dont want answer. I just need to get started. so How do i start?

    Design a ER diagram and a relational schema for a message board.

    1. Message board (or category)
    2. Messages
    3. Message replies
    4. Topics
    5. Topic replies
    6. Topic watch
    7. Users

    1. A message must belong to one topic
    2. A message board may belong to another message board
    3. A topic must belong to one message board
    4. A topic can have one or more messages
    5. A user can send and receive a message
    6. A user can create a topic
    7. A user can request a topic watch on a specific topic
    8. A user should have identifying features
  2. jcsd
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