I have enough SQL knowledge to replicate most websites I see. I am also familiar with it enough to look up things I don't know and use them. If that's not "working knowledge", you're using some different definition.
You can have working knowledge of e.g. calculus but need to look things up because you haven't memorized everything yet, and can learn some new method quickly. Someone without working knowledge would simply be lost, no matter what cheat sheets you put in front of them.
You can have working knowledge of e.g. calculus but need to look things up because you haven't memorized everything yet, and can learn some new method quickly. Someone without working knowledge would simply be lost, no matter what cheat sheets you put in front of them.