Problem description & analysis:
We have an annual and monthly water-consumption data table, and the year is filled in only on the left of the first month of each year. Part of the data is shown as below:
Task: Calculate the total water consumption of each year.
Solution:
Use SPL XLL and enter the formula in cell D1:
=spl("=E(?1).derive(:TotalWater).group@i(Year!=null).run(~(1).TotalWater=~.sum(Water)).conj().new(TotalWater)",A1:C20)
The results are as follows:
When meeting a non-null value in the column Year, create a new group. Option @i means creating a new group when the condition is satisfied. Assign the sum(Water) of the current group to the first row of each group, and create a new data set and take out the TotalWater.
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