Here is the performance stats of the solution by jimgawn for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:21PM | 8304 | 0 | 110 | 0.1000 |
| 2 | Apr 21 2010 11:51PM | 8304 | 0 | 109 | 0.1010 |
| 3 | Apr 22 2010 12:21AM | 8304 | 0 | 109 | 0.1020 |
| 4 | Apr 22 2010 12:51AM | 8304 | 0 | 109 | 0.1030 |
| 5 | Apr 22 2010 1:21AM | 8304 | 0 | 94 | 0.1030 |