anthony.green (7/27/2012)
John's solution just run again took 8mins 8 secondsLynn's solution as used in a iTVF took 18 minutes 26 seconds.
How many rows are you working with? It would be interesting to see how the cross-tab method compares.
For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden