I am having 4 years suppose 2009, 2010, 2011, 2012. Now i am having customers in all the years. I have to display the customers who exists in 2009 but not in next two consecutive years but are regained in 2012. I only want to show the customers who were in 2009 & also at present but not in 2010 & 2011. I also don't want to show the customers others than of 2009.