I think the key here is to focus on the aggregation functions specifically mentioned in SIGNAL, not general SQL functions. Based on that, I'm going with BOOL_OR, FIRSTO, and COALESCE as my answers.
Wait, is INNER JOIN an aggregation function in SIGNAL? I'm not sure about that one. I know BOOL_OR and FIRSTO are correct, but I'm a bit confused about the third option.
Hmm, I'm a little unsure about this one. Let me think through the aggregation functions I know in SIGNAL. I think BOOL_OR and FIRSTO are two, but I'm not confident about the third. I'll have to review my notes to be sure.
I'm pretty sure BOOL_OR, FIRSTO, and COALESCE are the correct aggregation functions in SIGNAL. I'll double-check those and make sure I have the right answers.
SIGNAL aggregation functions, huh? Piece of cake! B, C, and D all the way. Oh, and DAVG()? That's like the Loch Ness Monster of SIGNAL - mythical and never to be seen.
Ah, BOOL_OR, FIRSTO, and COALESCE - those sound about right. I wonder if they'll throw in a trick question like 'DAVG()' just to see if we're paying attention.
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