oracle报错ORA-00918: 未明确定义列

SELECt * FROM (SELECt A.*, ROWNUM rn FROM (
     select DEP.*, DET.DET_NAME,  DET1.DET_NAME
          from NORMAL.TB_DEPARTMENT DEP,  NORMAL.TB_DETAIL DET,  NORMAL.TB_DETAIL DET1
          where 1=1 and DEP.DEP_TYPE = DET.DET_ID and DEP.DEP_LEVEL = DET1.DET_ID
         ) A WHERe ROWNUM <= 10) WHERe rn >= 1

如此..如何区分同名列