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I am looking for good-designed and real life relational database diagrams. Could you offer any book or other sources? I prefer books.

Thank you.

akadal
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Not sure what you mean with "real-life relational database diagrams", but any data structures that you need serialized in a relational (SQL) scheme, must first come from a class or class-like diagram. in order to create a well-designed relational database structure based on these classes, one must first submit it to a series of transformations, known as Normalization Degrees. This will help keep your database redundancy-free and organized. (except when redundancy is a business requirement defined by you).
PDF books: http://cir.dcs.uni-pannon.hu/cikkek/Database_Normalization.pdf http://www.cs.cityu.edu.hk/~helena/cs34622000B/Normalization.pdf

I hope this helps!

Fernando Pérez
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