That wouldn't be possible to parse, because of how column aliasing works: the "AS" keyword is optional. In other words, "SELECT foo something_else" is equivalent to "SELECT foo AS something_else".
Also, I seem to recall that very old versions of Oracle did require commas between joins. (The join conditions had to be stated in the WHERE clause back then, instead of supporting the ON clause, iirc).
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That wouldn't be possible to parse, because of how column aliasing works: the "AS" keyword is optional. In other words, "SELECT foo something_else" is equivalent to "SELECT foo AS something_else".
Also, I seem to recall that very old versions of Oracle did require commas between joins. (The join conditions had to be stated in the WHERE clause back then, instead of supporting the ON clause, iirc).