Add values in a column according to value in another column

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Subject: Add values in a column according to value in another column
Posted by:  Paul Kaye (paulmjka…@gmail.com)
Date: Thu, 10 Jul 2008

How can I add the values in a column according to values in another
column? If there is any value in a row in column B, I want to include
the value of the corresponding row in column A. I'm flexible as to
whether this is ANY value (i.e. not empty) or greater than zero.

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