Robert Haas <robertmh...@gmail.com> wrote: > Tom Lane <t...@sss.pgh.pa.us> wrote: >> Personally my advice is to avoid USING: it wasn't one of the SQL >> committee's better ideas. > > I don't understand why we can't just translate the USING into some > equivalent construct that doesn't involve USING. I proposed that > a while ago and you shot it down, but I didn't find the reasoning > very compelling. There's no query you can write with USING that you can't write in a longer form with ON; but a query of moderate complexity can become significantly shorter with USING, and thus easier to understand and less prone to bugs than the ON form. I think it's a mistake to discourage USING or under-support it compared to the more verbose constructs. -Kevin
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