代码在oracle 11g中运行

Question

我有3个表case_details，codehead和case_staus。我试图从数据库中获取值。下面提到的代码在oracle 10 xe中运行良好，但在oracle 11g 32位中它显示0行...代码是

select a.case_id
      ,a.case_description
      ,a.case_contract_value
      ,b.sub_codehead
      ,c.case_status_name
  from case_details a
      ,codehead     b
      ,case_status  c
 where a.case_codehead = b.code_id
   and a.case_status = c.case_status_id
   and joint_directorate = 85
   and case_status < 2
 order by case_id;

我无法理解正在运行的代码没有在oracle 11g中执行...请帮帮我..