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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Button to make record

Еhere is a table where all clients are written, and in this table there are several more sub tables. We created a button separately from all tables through it we make entries in all tables.…

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