Here is the performance stats of the solution by SparkS for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:39PM | 8552 | 0 | 32 | 0.0430 |
| 2 | Apr 22 2010 12:09AM | 8552 | 0 | 47 | 0.0470 |
| 3 | Apr 22 2010 12:39AM | 8552 | 0 | 16 | 0.0420 |
| 4 | Apr 22 2010 1:09AM | 8552 | 0 | 32 | 0.0400 |
| 5 | Apr 22 2010 1:39AM | 8552 | 0 | 47 | 0.0420 |