Here is the performance stats of the solution by Erick for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:18PM | 1908 | 0 | 47 | 0.0510 |
| 2 | Apr 21 2010 11:48PM | 1908 | 0 | 31 | 0.0320 |
| 3 | Apr 22 2010 12:17AM | 1908 | 0 | 46 | 0.0440 |
| 4 | Apr 22 2010 12:47AM | 1908 | 0 | 31 | 0.0410 |
| 5 | Apr 22 2010 1:18AM | 1908 | 0 | 47 | 0.0380 |