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Hello (sorry do not speak in English)
there is a table
Price without discount
Sum of Discounted
It is necessary to select only those checks which have discount and skip the checks that have no discount. And to calculate the amount of revenue these checks.
(If it was possible, I would like to calculate the price and dishes that were in the checks which had a discount but for which the discount is not applied, but it is probably very difficult ..)
Thank you very much for your help!