Free How to Misuse SQL’s FROM Clause Tutorial

Well, well, well. Not quite. At the risk of sounding pedantic, perhaps a bitof (applied) theory would be welcome.How to Misuse the FROM ClauseRelational theory calls relations what most practitioners know as tables–a list of unordered statements (the rows) about the various qualities(the column values) associated with some entities uniquely identified by theprimary key. When you join tables, you derive other relations from the knownrelations, just like you often derive a theorem from 
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