我目前有这张桌子。
name title
Robert Pattinson Twilight
Daniel Radcliff NULL
Leonardo Dicaprio NULL
Charlie Chaplin The kid
Charlie Chaplin The Circus
Charlie Chaplin Timelight
John Abraham Dhoom
John Abraham Race 2
有没有办法避免像Charlie Chaplin这样的重复属性，并得到如下结果？
name title
Robert Pattinson Twilight
Daniel Radcliff NULL
Leonardo Dicaprio NULL
Charlie Chaplin The kid, The Circus,Timelight
John Abraham Dhoom,Race 2