How to left pad zeros for a column in Sql Server

I had a requirement where I need to left pad zeros for a column in MS SQL Server. I thought the below methods would be helpful for the concerned.

select empid,          
       replicate('0', 6 - len(salary)) + cast (salary as varchar) as salary
from   emp;  

empid       salary
----------- -----------
1           000300
2           000030
3           500000
4           001000

(4 row(s) affected)