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.
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