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Excel Magic Trick 694: SUMIF Can't Handle Arrays. SUMIF(YEAR(A2:A10),2010,B2:B10) Won't Work

Learn about how the SUMIF function (and COUNTIF, etc.) cannot accept arrays. If you need to sum by year from transactional data the SUMIF and YEAR functions cannot be used together. Instead we can use the SUMPRODUCT function. Adding with 1 one criteria condition.
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