Re: iwant to check whether the id present in 2014 also exists in 2015 ,how to do this ?
I don't understand how that would work. You are counting instances of a an ID over two years, how would you like to do that month wise or day wise? Do you mean compare two months or two days? Which months or days? You might need a front end solution for that - but I would post a new question rather than continue the discussion here.