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 | 17102 | 0 | 94 | 0.0900 |
| 2 | Apr 22 2010 12:09AM | 17102 | 0 | 109 | 0.1190 |
| 3 | Apr 22 2010 12:39AM | 17102 | 0 | 93 | 0.0840 |
| 4 | Apr 22 2010 1:09AM | 17102 | 0 | 93 | 0.2300 |
| 5 | Apr 22 2010 1:39AM | 17102 | 0 | 78 | 0.1160 |