谁能帮我写个sql的查询删除语句。具体要删除的东西如下图：要删除黑色部分数据。

delete source where SUBSTRING(cast(sou_date as varchar),1,4)='2011' and sou_time=(select sou_time from source where SUBSTRING(cast(sou_date as varchar),1,4)='2010') and sou_kh=(select sou_kh from source where SUBSTRING(cast(sou_date as varchar),1,4)='2010')
and SUBSTRING(cast(sou_date as varchar),6,5)=(select SUBSTRING(cast(sou_date as varchar),6,5) from source where SUBSTRING(cast(sou_date as varchar),1,4)='2010')