Question : Using Cast to convert nchar - > nvarchar

Hi guys!

im a real dummy when it comes to databases and need some help with a simple query!

im trying to query a DB which has a list of "rogue" computers in the company (kinda nac solution) - but whenever i query the MS SQL Db - i get one row which is empty (THE Mac address row)
anyhows , from here to there i talked to a few guys who said there is a problem with the agent driver im using and the simplest way to ovveride this is to use the CAST command.

here is the query , how do i use cast in order to convert the ROW called MAC from nchar12 to nvarchar?

SELECT HostId,NetBiosName,Users,OSPlatform,MAC FROM Hosts

Answer : Using Cast to convert nchar - > nvarchar

what about this:
select substring(mac, 1,2) + ':' + substring(mac, 3,2) + ':' + substring(mac, 5,2) + ':' + substring(mac, 7,2) + ':'  + substring(mac, 11,2) + ':' + substring(mac, 13,2)  as mac_formatted
from yourtable