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小 發表於 2016-4-2 10:44 PM (第 2939 天)
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Sorry for replying late, isabellaaa! I don't think I have such a part in my SBA (probably because different schools have different formats). However, according to my interpretation, the rules and constraints should be about the rental system: e.g. what are the constraints for user input? How many orders/applications can a user put at a time? (An ER diagram may trigger some thoughts!). Here are some information for your reference: in my SBA, I put down constraints for the data dictionary (tables describing the tables in the database), like NOT NULL or UNIQUE. Don't know if these are related though:p