These are some awesome site on database.
http://www.esp.org/db-fund.pdf
http://wserver.flc.losrios.edu/~davis/Chapter1.htm
http://www.tutorialspoint.com/sql/sql-rdbms-concepts.htm
http://en.wikibooks.org/wiki/Relational_Database_Design/Basic_Concepts
http://dbmsbasics.blogspot.in/
http://www.cs.umb.edu/cs630/hd1.pdf
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