How can I produce total marks for only last three column where is my fields and result will be:- ID 2004 2005 2006 2007 2008 2009 2010 2011 2012 Total Marks 1 6 6 6 8 0 0 0 0 0 20 2 10 10 0 10 0 8 0 8 8 24 3 6 6 6 10 10 0 0 10 0 30 4 0 0 6 10 10 10 0 10 8 28 5 0 0 2 6 6 8 0 0 0 20 6 0 0 0 8 10 8 0...