我如何获得列名称和/或值？

select 
t.slotmachinebk,
t.gamingdate, 
t.freeplaydownloaded, 
t.freeplayadjusted, 
t.freeplayplayed, 
t.freeplayabandoned, 
t.freeplaybalance 
from (select * from freeplay.egmfreeplay union all select * from Change.EgmFreePlay) t where not exists (select * from  testtable where

slotmachinebk = t.slotmachinebk and
auditdate = t.gamingdate and
freeplaydownloaded = t.freeplaydownloaded and
freeplayadjusted =  t.freeplayadjusted and
freeplayplayed = t.freeplayplayed and
freeplayabandoned = t.freeplayabandoned and 
freeplaybalance = t.freeplaybalance)
select 
t.slotmachinebk,
t.gamingdate, 
t.freep