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I'm having trouble writing a set analysis.
I want to calculate the avg(sum(weight)) for this year or for a selected month.
The month is also a calculated field: month(empty_date)
Because emprt_date is a timestamp.
Can anyone help me write this?
sum() is an aggregation function as is avg() - you can't put one around the other afaIk. Try
>>> aggr(sum(weight), month) <<<