Relationship between "Chice" and "Formula" fields

The table has two fields, a choice "Category" and a formula field "Discount" . Depending on the client category, a discount is assigned. Can someone, please, tell me the formula, for example,…

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Two fields sum

I have two fields and in the third it shows me the sum of these two fields. They must be summed if one of them is not equal to zero. Can anyone tell me the formula please

Sum of fields for a period of time

I have a table "credit_Fill" and the second table "Tables". In the Credit table there is a credit field, in which credits are recorded that are related to a particular table.…

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