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我有一個表在Excel中:EXCEL,總結不同產品的數量,其中月份是一月
Date Product Quantity
1/4/2016 A 3
1/4/2016 B 2
1/8/2016 A 7
2/3/2016 B 5
2/5/2016 B 1
2/8/2016 A 4
我需要計算多少一個產品一月(無論是一天,正好一個月)被出售,FE:
A in January was sold 10,
B in January was sold 2,
A in February was sold 4
B in Feruary was sold 9