There are a variety of flavors of SQL. The following URLs are geared towards SQLite, which we used in this book for our temperature storage database:
SQLite homepage: http://www.sqlite.org/
SQLite downloads: http://www.sqlite.org/download.html
SQLite Documentation: http://www.sqlite.org/docs.html
W3 Schools SQL guide: http://www.w3schools.com/sql/default.asp