• gurbanov.1984 (7/5/2013)


    but

    for me this query very diffcult

    It's very difficult for us too, because we don't know what you want to do. Please explain providing as much detail as necessary. There's a link in my signature ('please read this') to an article which provides guidelines for asking questions and what you may need to provide to us to assist in answering your question.

    “Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - 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