Late comment. But as someone who deals with SQL on a regular basis (Lead QA Analyst) and trains others in how to use it, yeah you really need to know what you are doing as Andreah mentioned, in terms of testing if you're going to implement it on top of spaghetti code. (The city of heroes Auction House spaghetti code being the issue, not SQL).
I'm NOT AT ALL shocked that HC volunteers aren't eager to jump into Paragon Studios ancient (and probably nonsensical) setup for the Auction House. So yeah not shocked a lot of the bugs reported by Yomo Kimyata came back as "working as intended". I don't blame HC one bit. 😛