Say i have 15 rows of data and every 3 rows are grouped into a number from 1 to 5. Now say i have 3 sets of these 15 rows and their correlating groups 1-5, and i want to do the max of all the values from the 45 rows that are in group 1 or 2 or 3 or 4 or 5. how do i do this?
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