I haven't used it. Wikipedia explains that it doesn't have (equivalents to) ORDER BY, EXPLAIN, transactions, Skip/Take. It looks like it's proprietary -- but

I haven't used it. Wikipedia explains that it doesn't have (equivalents to) ORDER BY, EXPLAIN, transactions, Skip/Take. It looks like it's proprietary -- but worse, you can't even run it locally. So you're locked in to a closed source DB service provided by one vendor that is entirely irreproducible outside of that vendor's environment. That sounds like somewhere it's fallen short to me. What are you supposed to do if you have to leave Azure for some reason? Apparently you can't even access backups without raising a support ticket.