Here is the performance stats of the solution by Aguardientico for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:19PM | 1034 | 0 | 15 | 0.0350 |
| 2 | Apr 21 2010 11:49PM | 1034 | 0 | 31 | 0.0320 |
| 3 | Apr 22 2010 12:19AM | 1034 | 0 | 15 | 0.0150 |
| 4 | Apr 22 2010 12:49AM | 1034 | 0 | 16 | 0.0340 |
| 5 | Apr 22 2010 1:19AM | 1034 | 0 | 16 | 0.0160 |