i have a fact table named "A" with 4 cloumns clicks cost dates product 1 1 1.00 2016-01-02 A 2 2 3.00 2016-01-03 B 3 5 16.00 2016-01-03 A 4 3 6.00 2016-01-04 A there have an error when use the sql like "select sum(clicks)/sum(cost) from xxxx group xxxx " and how can i group by "year" and "month" with cloumn "dates" ?
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