SQL For Web Nerds is a terrific resource for learning SQL. http://philip.greenspun.com/sql/ http://philip.greenspun.com/sql/ If your data model is built on top

SQL For Web Nerds is a terrific resource for learning SQL. http://philip.greenspun.com/sql/ http://philip.greenspun.com/sql/ If your data model is built on top of an RDBMS, learning how one works is the best first step to designing good data models!