I haven't read this particular book, but my comment is that a book from a different discipline can provide a useful perspective that is applicable to the SQL discipline.
For example, I've been working through the Ivor Horton book "Beginning Visual C++4" off and on for the past 3 years (I'm not a slow reader I've got 3 kids).
From this I've picked up hints on "Hungarian notation", that is prefixing variables and objects with a type identifier which is directly related to recent articles on this site.
It has also made me a better programmer because I have a greater appreciation of objects and their life cycle.
Application development books (not the teach yourself in 'x' days/hours books) are good because they tend to slant towards what people actually want to use databases for and therefore they give hints on the areas that you should target your skills.
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