Question

Hi I have SQL statement in DB2 which is working.

select  distinct 'IN' as STATUS,
    (select count(*) from table.......)
from table

UNION ALL

select  distinct 'OUT',
   (select count(*) from table.......)
from table

UNION ALL

select  distinct 'FINISHED',
   (select count(*) from table.......)
from table

order by status

But if I change the last line to

order by 
 case STATUS
 when 'IN' then 1
 when 'OUT' then 2
 when 'FINISHED' then 3
end

My query does not work.
Can someone tell me how to solve this?
Thanks

Answer 1

Try wrapping the UNION into a derived table and order on that:

select *
from ( 
   .... here goes your statement ...
) t
order by 
   case STATUS
      when 'IN' then 1
      when 'OUT' then 2
      when 'FINISHED' then 3
   end