From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stig Brautaset <stig@brautaset.org>
Subject: Conditional summing in column-mode?
Date: Thu, 24 Aug 2017 16:49:50 +0100
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I have the following column-mode defined in =~/org/Holidays.org=:

#+BEGIN_SRC org
  ,#+COLUMNS: %TIMESTAMP(When) %ITEM(What) %CONFIRMED(Confirmed?){X/} %DAYS(Days){+}
  ,#+Confirmed_ALL: "[ ]" "[X]"
  ,#+TODO: TODO | DONE CANCELLED
#+END_SRC

Is it possible to have the =%DAYS(Days){+}= part only sum up rows that
have an =[X]= in their =Confirmed?= property?

Stig

-- 
; GNU Emacs 26.0.50, Org mode version 9.0.9