Still SQL Server. It's still the best query planner where you can write sql however and it will basically work as fast as it can and faster than other databases. There's also automatic query tuning, which, well, tune queries or give you advice on how to improve them.
You can (and I do) suck at SQL and still have amazing performance. Comes with a price tho.
Second choice would be PostgreSQL. Not as fast, but at least sane, unlike that Maria/MySQL crap which is a match made in heaven with PHP crap.
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