我有表格的资料
Site,Year,Month,Count,Action
Site A,2012,1,10,Action A
Site A,2012,2,9,Action A
Site A,2013,1,12,Action A
Site A,2013,2,3,Action A
Site B,2012,1,6,Action A
Site B,2013,1,2,Action A
Site A,2012,1,3,Action B
Site A,2013,1,2,Action B
Site B,2012,1,20,Action B
Site B,2013,1,12,Action B
...
然后,我想