Here is the performance stats of the solution by swalker for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:38PM | 1388 | 0 | 47 | 0.2830 |
| 2 | Apr 22 2010 12:08AM | 1388 | 0 | 78 | 0.2250 |
| 3 | Apr 22 2010 12:38AM | 1388 | 0 | 62 | 0.2580 |
| 4 | Apr 22 2010 1:08AM | 1388 | 0 | 62 | 0.7130 |
| 5 | Apr 22 2010 1:38AM | 1388 | 0 | 62 | 0.2300 |