Query to find users from Australia
I don't like how you're specifying the column aliases. I expect a whitespace between the column and the alias.

I like that you're not specifying the optional AS keyword though - I find it only adds clutter when it's there.

Also I would have used [square brackets] instead of single quotes, and layout the field names on separate lines, like this:

SELECT 
     u.DisplayName [Display Name]
    ,u.Reputation [Rep]
    ,u.Location [Location]


That way you can easily add, reorder, or comment-out a column if you need to.