Oracle 如何在不显示列名的情况下取消显示表数据

    select        
    t1.id as dbid,
    t2.mid as askid,
    t3.m2idd as amid from
    table1 t1, table2 t2, table3 t3 where
    t1.actid = t2.senid
    and t2.denid = t2.mkid
    );

dbid       askid         amid
================================
d1           m1            a1

SOURCE_ID    DEST_ID
========================
m1             d1
a1             d1

select DEST_ID,SOURCE_ID from 
    (select        
    t1.id as dbid,
    t2.mid as askid,
    t3.m2idd as amid from
    table1 t1, table2 t2, table3 t3 where
    t1.actid = t2.senid
    and t2.denid = t2.mkid
    )
    unpivot INCLUDE NULLS (SOURCE_ME_GUID FOR DEST_ME_GUID IN (amid, askid));

select dbid, SOURCE_ID 
from (
  select 'd1' dbid, 'm1' askid, 'a1' amid
  from   dual
) unpivot INCLUDE NULLS (
  SOURCE_ID FOR DEST_ID IN (amid, askid)
);

DBID   SOURCE_ID   
d1     a1          
d1     m1