I am trying to figure out how to add some sort of mask to my data. Currently I have a query like this:
SELECT [EmployeeTC_No] AS \"Employee TC#\" ,[pye_nla
This is not ideal, since you appear to not be storing dates as a date type. If they are varchars, and you want to just add slashes for presentation, you can insert them where needed. This is assuming you always have a 8char date:
SELECT STUFF(STUFF(your_col, 3, 0, '/'), 6, 0, '/')