Oracle sql 去重

delete
from key_rkjcb
where zjhm_695 in (select zjhm_695 from key_rkjcb group by zjhm_695 having count(zjhm_695) >1)
and rowid not in (select min(rowid) from key_rkjcb group by zjhm_695 having count(zjhm_695 )>1);