Here is the performance stats of the solution by David Betteridge for TSQL Challenge18.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 8 2010 11:46PM | 2530 | 0 | 1388 | 1.919 |
| 2 | Apr 9 2010 12:10AM | 2530 | 0 | 1450 | 1.743 |
| 3 | Apr 9 2010 12:35AM | 2530 | 0 | 1404 | 1.805 |
| 4 | Apr 9 2010 12:59AM | 2530 | 0 | 1373 | 1.720 |
| 5 | Apr 9 2010 1:23AM | 2530 | 0 | 1232 | 1.565 |