Here is the performance stats of the solution by Naras for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:31PM | 844 | 0 | 16 | 0.0490 |
| 2 | Apr 22 2010 12:00AM | 844 | 0 | 16 | 0.0140 |
| 3 | Apr 22 2010 12:30AM | 844 | 0 | 0 | 0.0290 |
| 4 | Apr 22 2010 1:00AM | 844 | 0 | 15 | 0.0140 |
| 5 | Apr 22 2010 1:31AM | 844 | 0 | 16 | 0.0140 |