Here is the performance stats of the solution by rob_farley for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:37PM | 205 | 0 | 31 | 0.0280 |
| 2 | Apr 22 2010 12:07AM | 205 | 0 | 31 | 0.0290 |
| 3 | Apr 22 2010 12:37AM | 205 | 0 | 32 | 0.0260 |
| 4 | Apr 22 2010 1:07AM | 205 | 0 | 31 | 0.0260 |
| 5 | Apr 22 2010 1:37AM | 205 | 0 | 31 | 0.0310 |