Rating: 

The book has no discussion of subqueries although there are a few examples where subqueries are used without explanation or comment. I teach in the evenings and was hoping to refer my students to this book as a reference. The lack of even an index entry for subquery, correlated subquery, union, or except makes the book unsuitable for students, and incomplete for an experienced user.

If you are expecting something as comprehensive as Java in a Nutshell or VBScript in a Nutshell, you will be disappointed. The chapter on SQL functions is adequate, but most of the topics I looked into were incomplete. I found myself returning to an older reference that I have owned for several years that I won't mention here.