Merge data by date
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I have a big matrix of an hourly consumption of 5 houses for 2 years. The matrix has two columns: one with date in this format: " 2020-10-05 00:00:00 " and the other column as data.
I would like to order the data based on date. So for " 2020-10-05 00:00:00 " the sum of each house. I tried to do it manually but its a long way and I feel that there is a way to do it with a loop more efficiently.