First has been the user's needs, how to set up the database, the specific process should be? What should be prepared to work? Er figure? DFD diagram?

CodePudding user response:

http://www.csdn.net/article/2012-04-11/2804419

CodePudding user response:

"Introduction to database system (fourth edition)" wang shan 31 silberschatz higher education press
There are detailed in the book, a few pages, not a word of two language can speak clearly,

CodePudding user response:

This is main or according to the specific requirements, to design,

You mentioned above such as e - r, it is quite useful, concrete powerdesigner this tool can be used to design