oracle按时间查询翻页时出现与前面一页重复数据

用hibernate查询分页时，翻页显示中有少量记录是重复的。已经确认sql写法没错误。
select savebillin0_.*,entityacct2_.*
from save_bill_info savebillin0_,
CUST_INFO custinfo1_,
entity_acct_bill entityacct2_
where savebillin0_.cust_id = custinfo1_.ID
and entityacct2_.ACCOUT_ID =
(select max(entityacct3_.ACCOUT_ID)
from entity_acct_bill entityacct3_
where entityacct3_.SAVEBILL_ID = savebillin0_.SAVEBILL_ID)
and savebillin0_.OPER_STATUS <> 'BPP00'
and savebillin0_.ADSCRIPTION_ID = '00010015'
order by entityacct2_.OPER_DATE desc   
经过发现当oper_date这个字段为同一天时，导致翻页出现少量重复数据，加入,savebillin0_.savebill_id desc 唯一性字段的排序后可以解决，可能跟oracle内部排序细节有关系。