A very good book on SQL databases. Describes how to create a database. Syntax MySQL and mSQL (the most common at the moment the database). Working with databases via various interfaces With ++, Perl, PHP. One of the best books for those who want to learn how to work with SQL databases. And take off your work is after I wrote one guest book that used SQL, is not one of my future projects not do without MySQL. Also recently, customers themselves have demanded that their portal worked in SQL.