org: Agenda column view

 
 10.8 Using column view in the agenda
 ====================================
 
 Column view (SeeColumn view) is normally used to view and edit
 properties embedded in the hierarchical structure of an Org file.  It
 can be quite useful to use column view also from the agenda, where
 entries are collected by certain criteria.
 
 ‘C-c C-x C-c     (org-agenda-columns)’
      Turn on column view in the agenda.
 
    To understand how to use this properly, it is important to realize
 that the entries in the agenda are no longer in their proper outline
 environment.  This causes the following issues:
 
   1. Org needs to make a decision which ‘COLUMNS’ format to use.  Since
      the entries in the agenda are collected from different files, and
      different files may have different ‘COLUMNS’ formats, this is a
      non-trivial problem.  Org first checks if the variable
      ‘org-agenda-overriding-columns-format’ is currently set, and if so,
      takes the format from there.  Otherwise it takes the format
      associated with the first item in the agenda, or, if that item does
      not have a specific format (defined in a property, or in its file),
      it uses ‘org-columns-default-format’.
   2. If any of the columns has a summary type defined (SeeColumn
      attributes), turning on column view in the agenda will visit all
      relevant agenda files and make sure that the computations of this
      property are up to date.  This is also true for the special
      ‘CLOCKSUM’ property.  Org will then sum the values displayed in the
      agenda.  In the daily/weekly agenda, the sums will cover a single
      day; in all other views they cover the entire block.  It is vital
      to realize that the agenda may show the same entry _twice_ (for
      example as scheduled and as a deadline), and it may show two
      entries from the same hierarchy (for example a _parent_ and its
      _child_).  In these cases, the summation in the agenda will lead to
      incorrect results because some values will count double.
   3. When the column view in the agenda shows the ‘CLOCKSUM’, that is
      always the entire clocked time for this item.  So even in the
      daily/weekly agenda, the clocksum listed in column view may
      originate from times outside the current view.  This has the
      advantage that you can compare these values with a column listing
      the planned total effort for a task—one of the major applications
      for column view in the agenda.  If you want information about
      clocked time in the displayed period use clock table mode (press
      ‘R’ in the agenda).
 
   4. When the column view in the agenda shows the ‘CLOCKSUM_T’, that is
      always today’s clocked time for this item.  So even in the weekly
      agenda, the clocksum listed in column view only originates from
      today.  This lets you compare the time you spent on a task for
      today, with the time already spent (via ‘CLOCKSUM’) and with the
      planned total effort for it.