On of our SQL statements has a field which contains a "?".

I ran a simple test.

Select ;
     [a?b] as Url ;
   From < table >

The question mark disappears. Below fixes the problem.

Select ;
     [a] + Chr(63) + [b] as Url ;
   From < table >

I'm betting this has been documented already. What is the reason for this behavior?

TIA