How to calculate multiple database items

Guys, good night! My database has a list of expenses and I would like to add these values conditioning the repeater group filter.
Example: When selecting January 2020, I would like to show the sum of all expenses for that month. Do the same with the category filter. How can I do this?

Um, sum?

If you want to display a list of totals - either by month or category - within a repeating group, check out :group by.

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It worked. Thank you very much!

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