Here is the performance stats of the solution by mzz3lh for TSQL Challenge21.
| Attempt | Start Time | Reads | Writes | CPU | Duration (Sec) |
| 1 | May 26 2010 3:41PM | 30276 | 0 | 2449 | 2.997 |
| 2 | May 26 2010 4:45PM | 30276 | 0 | 2231 | 2.341 |
| 3 | May 26 2010 5:33PM | 30276 | 0 | 2277 | 2.472 |
| 4 | May 26 2010 6:21PM | 30276 | 0 | 2294 | 2.405 |
| 5 | May 26 2010 7:10PM | 30276 | 0 | 2262 | 2.430 |