--- question/type/numerical/db/upgrade.php	2011-12-14 09:06:41.661913300 -0600
+++ question/type/numerical/db/upgrade-patched.php	2011-12-14 09:10:27.543499200 -0600
@@ -70,8 +70,9 @@
 
         // Set a better default for questions without units.
         $DB->execute('
-                UPDATE {question_numerical_options} qno
-                   SET showunits = 3
+                UPDATE qno
+                   SET qno.showunits = 3
+                   FROM {question_numerical_options} qno
                  WHERE NOT EXISTS (
                          SELECT 1
                            FROM {question_numerical_units} qnu