现在有一个列叫 addtime

值都是 2009-06-01 11:11:11
       2009-06-01 11:11:11
       2008-06-01 11:11:11
       2010-06-01 11:!1:11

我想查出
2008
2009
2010


select  distinct  year(addtime)  from ydty_list