title: How do you create a non-clustered index for a string column in SQL Server?
body: <p>I just tried this and got the helpful message that</p>
  
  <p>Column 'Username' in table 'Users' is of a type that is 
  invalid for use as a key column in an index.</p>
  
  <p>Username is an nvarchar(max) column.</p>