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David Johnston pointed out that the original text here had been obsoleted by SQL:2008, which allowed ORDER BY in subqueries. We could weaken the text to describe ORDER-BY-in-subqueries as an optional SQL feature that's possibly unportable; but then the exact same statements would apply to the alternative it's being compared to (ORDER-BY-in-aggregate-calls). So really that would be pretty useless; let's just take out the sentence entirely. Instead, point out the hazard that any extra processing in the upper query might cause the subquery output order to be destroyed. Discussion: <CAKFQuwbAX=iO9QbpN7_jr+BnUWm9FYX8WbEPUvG0p+nZhp6TZg@mail.gmail.com>