Title: Theoretical,takes work to translate it into something useful
Product review: One can tell that this work stems from the research of the author but he fails to translate it into something useful. It took a lot of effort to translate the concepts into something that my students would use in the database real world. I got sick of the little sidebars that had interesting but useless tidbits concerning notions of time. This is not for the developer but it might be useful for someone that is SQL knowledgeable that wants to check out some variations on time and temporal specifications.
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