google-sheets - 月份的总和值

Question

我有一个值、日期和类别表：

5   1.09.2013   red
-7  2.09.2013   red
9   21.09.2013  red
-2  3.10.2013   red
11  28.09.2013  green
3   2.10.2013   green
8   16.10.2013  green

我计算类别为绿色的值的总和：

=sum(filter(A:A;C:C="green"))

如何仅对 10 月份类别为绿色的值求和？

Answer 1

The following formula can help:

=SUM(FILTER(A:A, C:C = "green", VALUE(REGEXREPLACE(B:B, "^\d+\.|\.\d+$", "")) >= 10))

UPDATE

Here a sample with the test data set.