Here is the performance stats of the solution by Sergejack for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:39PM | 7896 | 0 | 359 | 0.3930 |
| 2 | Apr 22 2010 12:08AM | 7896 | 0 | 421 | 0.4190 |
| 3 | Apr 22 2010 12:38AM | 7896 | 0 | 405 | 0.9371 |
| 4 | Apr 22 2010 1:08AM | 7896 | 0 | 374 | 0.5880 |
| 5 | Apr 22 2010 1:39AM | 7896 | 0 | 328 | 0.6580 |