ORACLE 语句关联统计

select  t.telno as 主号,VID 副号,t.area_code 地区, t.reg_time 注册时间,t.reg_source 注册工号,t.bill_start_date 计费时间, 
 (case state  when 0
 then ‘0 正常‘  end)计费状态　from t_unreg_log t where t.bill_start_date<to_date(‘20150301‘,‘yyyymmdd‘) and t.bill_start_date>to_date(‘20150201‘,‘yyyymmdd‘)
  and t.unreg_time<to_date(‘20150301‘,‘yyyymmdd‘) and t.unreg_time>to_date(‘20150201‘,‘yyyymmdd‘)
   and t.type=‘9‘ union
    select   t.telno as 主号,VID 副号,t.area_code 地区, t.reg_time 注册时间,t.reg_source 注册工号,t.bill_start_date 计费时间, 
 (case state  when 0
 then ‘0 正常‘  end)计费状态　from t_unreg_log t where t.bill_start_date<to_date(‘20150301‘,‘yyyymmdd‘) and t.bill_start_date>to_date(‘20150201‘,‘yyyymmdd‘)
  and t.unreg_time>to_date(‘20150301‘,‘yyyymmdd‘)
  union
   
   select t.telno as 主号,VID 副号,t.area_code 地区, t.reg_time 注册时间,t.reg_source 注册工号,t.bill_start_date 计费时间, 
 (case state  when 0
 then ‘0 正常‘  end)计费状态 　from t_unreg_log t where t.bill_start_date is not null
 and t.bill_start_date<to_date(‘20150201‘,‘yyyymmdd‘)  and t.unreg_time<to_date(‘20150301‘,‘yyyymmdd‘) and t.unreg_time>to_date(‘20150201‘,‘yyyymmdd‘) 
 and t.type=‘9‘
      union
    select t.telno as 主号,VID 副号,t.area_code 地区, t.reg_time 注册时间,t.reg_source 注册工号,t.bill_start_date 计费时间, 
 (case state  when 0
 then ‘0 正常‘  end)计费状态   from t_online_info t where t.bill_start_date is not null and t.bill_start_date<to_date(‘20150301‘,‘yyyymmdd‘))