very good, if you are very good,
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This review is from: Joe Celko's SQL for Smarties: Advanced SQL Programming (The Morgan Kaufmann Series in Data Management Systems) (Paperback)
Don't underestimate the amount of knowledge required to understand this. It is an into depth book and if you are a novice to SQL you'll have a hard time to follow Joe. He obviously is very good so he shows you a multitude of "best possible solutions" assuming you know quite a bit already.
Yes, it took me quite a bit of reading to fully understand his solutions but in the end they are worth the effort of buying & using the book to create better solutions for everyday programmer issues.