Added A Primer on SQL, Second Edition.

d16817b7 · Josh Lieberman · d6295233 · d16817b7
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 ###SQL (implementation agnostic)
+* [A Primer on SQL, Second Edition](https://leanpub.com/aprimeronsql)
 * [Developing Time-Oriented Database Applications in SQL](http://www.cs.arizona.edu/people/rts/publications.html)
 * [Learn SQL The Hard Way](http://sql.learncodethehardway.org/)
 * [SQL For Web Nerds](http://philip.greenspun.com/sql/)