Here is the performance stats of the solution by mzz3lh for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:29PM | 830 | 0 | 16 | 0.0130 |
| 2 | Apr 21 2010 11:59PM | 830 | 0 | 16 | 0.0130 |
| 3 | Apr 22 2010 12:29AM | 830 | 0 | 16 | 0.0140 |
| 4 | Apr 22 2010 12:59AM | 830 | 0 | 16 | 0.0140 |
| 5 | Apr 22 2010 1:29AM | 830 | 0 | 16 | 0.0130 |