Here is the performance stats of the solution by pareri for TSQL Challenge20.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | Apr 21 2010 11:32PM | 9390 | 0 | 47 | 0.0520 |
| 2 | Apr 22 2010 12:02AM | 9390 | 0 | 63 | 0.0650 |
| 3 | Apr 22 2010 12:32AM | 9390 | 0 | 47 | 0.0490 |
| 4 | Apr 22 2010 1:02AM | 9390 | 0 | 47 | 0.0500 |
| 5 | Apr 22 2010 1:32AM | 9390 | 0 | 62 | 0.0610 |