However, the fact that Hugo admits to having to Google this one might suggest that this question is a little on the esoteric side, and that you could be quite good at your job without knowing or caring about the answer!
I think that if "you could be quite good at your job without knowing or caring about the answer" is the measure for the QotD, then we could remove, depending on the exact job people are doing, somewhere between 80-90% of all questions.
I never use BI in my work. Yet, I like QotD questions about BI, because they force me to look into technology I normally don't use, and help me learn. I also like trivia questions like this one, because I like to know a bit more than just the bare technical knowledge my job requires - and I also hope that this question will contribute a bit to making the issue and importance of normalization more well-known.