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    +1 for code smell. Queries joining tables through PK shouldn't return duplicates ; if they do maybe something is amiss :) Commented Dec 19, 2012 at 17:00
  • You are definitely right on this point. The schema is pretty poorly designed, with a lot of redundancy, from many years of having modules with new tables tacked on without a schema overhaul. Unfortunately, I have to live with what I have. Commented Dec 19, 2012 at 18:58