This, to me, is one of the great mind-blowing SQL queries. It means something like “find the dealer for which there exists no dealer selling the same product at a lesser price”. It is the “double negative” restatement of “most expensive”. In other words, “not the lesser expensive”. It’s this kind of radical restatement of problems that I hope to accomplish with my work. Of course this actually has nothing to do with Arel, although it’s expressible trivially in Arel. But it provides some insight into my thinking about why I write software and why I am concerned so much about how software is written.
