Please be aware that there is a second edition of this book (at the same price). Therefore, be sure you buy the second edition and not the original. Here is a link to the second edition: Cody's Data Cleaning Techniques Using SAS, Second Edition.

I have rewritten every program and every macro in the new edition. There are also many more useful macros available (you can download them from the SAS Web site). Also new is a chapter on SAS integrity constraints and audit trails.