Eine mögliche Lösung

[ursus contionabundo]

> select "uzzuuisdfhiwq" = CONVERT(0 using ASCII) ;

+------------------------------------------+
| "uzzuuisdfhiwq" = CONVERT(0 using ASCII) |
+------------------------------------------+
|                                        0 |
+------------------------------------------+
1 row in set (0.00 sec)


> select "" = CONVERT(0 using ASCII);

+-----------------------------+
| "" = CONVERT(0 using ASCII) |
+-----------------------------+
|                           0 |
+-----------------------------+
1 row in set (0.00 sec)