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。