title: generate guid for every row in a column
body: <p>I Have a stored procedure that has a table with one column and I need to generate a NEWID() for each row in that column.  Would I only be able to accomplish this with a loop?</p>
  
  <pre><code>+---+    +--------------------------------------+---+
  | a |    | FD16A8B5-DBE6-46AB-A59A-6B6674E9A78D | a |
  | b | =&gt; | 9E4A6EE6-1C95-4C7F-A666-F88B32D24B59 | b |
  | c |    | 468C0B23-5A7E-404E-A9CB-F624BDA476DA | c |
  +---+    +--------------------------------------+---+
  </code></pre>