snomad (12/20/2013)
...Any clues gratefully accepted.
🙂
A sample data set for folks here to run queries against would be gratefully accepted too! If you're not sure how to do this, click on the link in my signature below ("this article").
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