• Just a thought...what's this meant to do?

    (dbAddDate >= '2013-01-01' OR '2013-01-01' = '')

    AND (dbAddDate <= '2013-12-31' OR '2013-12-31' = '')

    “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