If you’re still interested to know more about data quality. Check this book out on Amazon. 
There are only positive reviews of this book: “Groundbreaking!” “A superb blend of theory and application.” The author, Jake E. Olsen, has been declared “a master practitioner.”
Jack Olson coined the term “data profiling” and essentially founded this important new field in the area of data quality assessment. His revolutionary techniques, outlined in this book, can provide IT professionals with an important new set of tools for analyzing data quality. This is a must read for anyone working in the data quality field today. I also recommend it for people in related fields such as data warehousing, Enterprise Application Integration, and database design. With so many “me too” books in the computer field, it’s a real joy to find a book that really does break new ground. ~Shawn B. Wikle “wik” (Austin, TX)
