sql语句比较新旧两个表数据中数据的一致性

  select a.callingcode,a.calledcode,a.calldate,a.calltime,a.billtype,a.money,
        b.callingcode,b.calledcode,b.calldate,b.calltime,b.billtype,b.money from bill08  a
 full join ( select * from   [JGDX-DATA].zcsoft_telecomm.dbo.bill08 where  calldate='2007-08-01' and  pbxid=1 ) b on  a.callingcode = b.callingcode
 and a.calldate = b.calldate and a.calltime = b.calltime and a.billtype =b.billtype
where ((a.callingcode is null ) or (b.callingcode is null))  or
      (a.callingcode = b.callingcode and a.money != b.money)