In spreadsheets you may use aggregating features like consolidation, subtotals, data pilots, sort/filter with extra options, SUMPRODUCT(), array-functions, any combination of MATCH(), LOOKUP(), INDEX(), OFFSET(), FIND(), SEARCH(). Most of this is prone to errors, because you may get wrong matches due to duplicates, wrong data-types, complexity of formulas. Reading the terms "sales" and "transaction" I think of a database.

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