अमान्य स्तंभ नाम, चयन-विवरण निर्मित स्तंभों पर

select q.* from (
select 
   u.UserId,
   cast((case when exists(select * from TblUser u where u.Disabled=1) then 1 else 0 end) as bit) as aVar, 
from TblUser u
)q 
where q.aVar = 1