Here is the performance stats of the solution by reganwick for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:36PM | 220 | 0 | 47 | 0.1870 |
| 2 | Apr 22 2010 12:06AM | 220 | 0 | 31 | 0.1940 |
| 3 | Apr 22 2010 12:36AM | 220 | 0 | 16 | 0.1440 |
| 4 | Apr 22 2010 1:06AM | 220 | 0 | 63 | 0.3810 |
| 5 | Apr 22 2010 1:36AM | 220 | 0 | 47 | 0.1270 |