Top positive review
Super clear quick reference
Reviewed in the United States on December 28, 2014
This book is not really for those who want all the little details of SQL. It's also not for those married to just one DB and want all the little customizations that particular DB offers. It is a great book for programmers who need a quick reference. It's also a great book to study if you want to stick with mainstream SQL.
Some nice things about the book are that the author mentions common differences between systems that are well-known. If he mentions something along these lines, you probably want to know about it. It is the perfect book for people to learn/use what I call "common SQL".