Hugo Kornelis (4/19/2015)
Oh, I absolutely am with you on the assumption that the data being queries is already aggregated on a per-month basis. I now, upon rereading, realise that my comment can be interpreted ambiguously.When writing that comment, I was only thinking of data that, for whatever reason, misses months.
Ah, I see, you were just excluding the zero case, not worrying about the more thatn one case - in that case, I agree with you.
Tom