• ta.bu.shi.da.yu (10/11/2010)


    If I read this correctly, you just implemented the LAG(...) Over(...) analytic function.

    However, I'm interested... if you do this on a large dataset, what does the execution plan look like?

    Got a BOL clicky-link for this, by any chance? ๐Ÿ˜‰

    โ€œWrite the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.โ€ - Gail Shaw

    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