use examples
/*
select *
from dbo.salary
order by customer_id
*/

declare @log_base bigint = 2
declare @scale float = 50

select *, REPLICATE('*',floor(customers/@scale)) as dist
from
	(
	select power(@log_base,floor(log(salary,@log_base))) as salary_linear, count(*) as customers
	from dbo.salary
	group by power(@log_base,floor(log(salary,@log_base)))
	) inc_linear
order by salary_linear