Here is the performance stats of the solution by yhangw for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:42PM | 8544 | 0 | 47 | 0.0450 |
| 2 | Apr 22 2010 12:12AM | 8544 | 0 | 46 | 0.0500 |
| 3 | Apr 22 2010 12:42AM | 8544 | 0 | 31 | 0.0490 |
| 4 | Apr 22 2010 1:12AM | 8544 | 0 | 31 | 0.0460 |
| 5 | Apr 22 2010 1:42AM | 8544 | 0 | 62 | 0.1020 |