There are some places where the information on SQL is not quite complete. For example, the section on data types doesn't give the sizes of the integer types. As another reviewer mentioned, the section on built-in functions doesn't provide enough information to use some of the more rarely used functions. But these omissions are minor; overall, the completeness of information on SQL is quite impressive.

If you're totally new to relational databases, and you need to design a database schema, you'll want to also get a book on database modeling and normalization, because these topics are not covered. But if you know relational databases or merely need to write queries and updates on an existing database, this book will be more than adequate.

In addition, if you want to access a database from Java or Perl, you'll also want a book on JDBC or DBI, respectively. Perhaps a future edition of the book will cover these topics in the SQL APIs chapter, but they're probably too new to have made it into this edition.