text: -- Arithmetic operation with two window functions
  -- CAST function on top of windowed aggregate
  select 
  	c_date,
  	c_time,
  	c_integer,
  	cast(count(*) over (partition by c_date ORDER BY c_time) as varchar(20))  ||  cast(sum(c_integer) OVER (partition by c_bigint order by c_time) as varchar(20)) 
  from 
  	j6_v 
  where 
  	c_integer is not null;
  