Dave Cramer <dave(at)fastcrypt(dot)com> writes:
> Referring to
> http://src.doc.ic.ac.uk/packages/dbperl/refinfo/sql3/sql3bnf.sep93.txt
> the following grammar exists
> is the reference above valid?
Sep 93? That would be an extremely early draft of what eventually became
SQL99. Looks like the parens got lost again by the time of the final
spec.
Given that there's no visible functionality gain from allowing parens
here, I'm not surprised that the spec authors decided it wasn't such
a hot idea after all... too bad Informix didn't get the word :-(
regards, tom lane