I think "I don't know" can be a perfectly acceptable answer. It's certainly preferable to awkward grasping at straws. I don't expect even a great candidate to a

I think "I don't know" can be a perfectly acceptable answer. It's certainly preferable to awkward grasping at straws. I don't expect even a great candidate to answer every question. Sometimes questions are simple probes to find bounds of knowledge and experience. I know a lot about game development. I've shipped quite a few games. I've worked on PC, consoles, iOS, gameplay, engines, clients, game servers, and more. I've never worked on the server backend infrastructure, graphics programmer, nor have I used Unity3D. If you ask me a real question about SQL or database management just about the only answer I can give you is "I don't know". I can't to tell you any differences, pros, or cons related to any javascript library nor any of the now numerous popular databases.