Here is the performance stats of the solution by jacek_szarapa for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:20PM | 10774 | 0 | 234 | 0.2980 |
| 2 | Apr 21 2010 11:50PM | 10774 | 0 | 250 | 0.2430 |
| 3 | Apr 22 2010 12:19AM | 10774 | 0 | 250 | 0.3600 |
| 4 | Apr 22 2010 12:49AM | 10774 | 0 | 249 | 0.3580 |
| 5 | Apr 22 2010 1:20AM | 10774 | 0 | 250 | 0.2420 |