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  • Medians pre-SQL 2012

    SQL 2012 was a big release for working out the median in SQL Server, with the advent of the function PERCENTILE_CONT(). It’s a very elegant way of working out the median (hint, that’s the 0.5 point), even though it’s not actually an aggregate function, as I’ve written before. Plus – it doesn’t even perform well. About a year ago, Aaron Bertrand ...
    Posted to Rob Farley (Weblog) by rob_farley on January 26, 2015
  • Mastering Execution Plan Analysis - Lisbon, Portugal 15 May 2015

    I will be presenting a full day workshop, “Mastering Execution Plan Analysis” on Friday 15 May 2015 as part of SQL Saturday #369 in Lisbon, Portugal. Early-bird tickets are priced at just €135 and are available until 28 February 2015, when the price increases to the regular rate of €150. Tickets can be purchased via EventBrite (where the full ...
    Posted to Paul White: Page Free Space (Weblog) by Paul White on January 13, 2015
  • Minimising Data Movement in PDW Using Query Optimisation Techniques

    This is a white paper that I put together recently about APS / PDW Query Optimisation. You may have seen it at http://blogs.technet.com/b/dataplatforminsider/archive/2014/11/14/aps-best-practice-how-to-optimize-query-performance-by-minimizing-data-movement.aspx as well, but in case you haven’t, read on! I think the significance of this paper is ...
    Posted to Rob Farley (Weblog) by rob_farley on December 4, 2014
  • How TOP wrecks performance (part 1)

    The TOP keyword in the SELECT clause may not be ANSI standard, but I am sure we have all used it. But do you know that it comes with two optional keywords? And have you used them? They are PERCENT and WITH TIES.   TOP   Let’s first look at the based functionality of TOP, and how it affects performance – which in fact, contrary to the ...
  • SQL Server Hardware

    From Red-Gate website you can download (for free) the ebook SQL Server Hardware written by Glenn Berry (@GlennAlanBerry). This ebook will provide the fundamental knowledge and resources you need to make intelligent decisions about choice, and optimal installation and configuration, of SQL Server hardware, operating system and the SQL Server ...
    Posted to Sergio Govoni (Weblog) by Sergio Govoni on October 29, 2014
  • Execution plans, laundry, and a giveaway

    In just a week from now, SQL Saturday #337 will kick off in Portland, Oregon. And I will be there – the third time already for me to be speaking in Portland. For a European, Portland is not the most logical location. But the organization over there is a pretty smart bunch of people. They figure that being close to Seattle gives them a great ...
  • SQL Spatial: Getting “nearest” calculations working properly

    If you’ve ever done spatial work with SQL Server, I hope you’ve come across the ‘nearest’ problem. You have five thousand stores around the world, and you want to identify the one that’s closest to a particular place. Maybe you want the store closest to the LobsterPot office in Adelaide, at -34.925806, 138.605073. Or our new US office, at ...
    Posted to Rob Farley (Weblog) by rob_farley on August 14, 2014
  • SSIS Lookup transformation in T-SQL

    There is no equivalent to the SSIS Lookup transformation in T-SQL – but there is a workaround if you’re careful. The big issue that you face is about the number of rows that you connect to in the Lookup. SQL Books Online (BOL) says: If there is no matching entry in the reference dataset, no join occurs. By default, the Lookup transformation ...
    Posted to Rob Farley (Weblog) by rob_farley on July 8, 2014
  • SQL 2014 does data the way developers want

    A post I’ve been meaning to write for a while, good that it fits with this month’s T-SQL Tuesday, hosted by Joey D’Antoni (@jdanton) Ever since I got into databases, I’ve been a fan. I studied Pure Maths at university (as well as Computer Science), and am very comfortable with Set Theory, which undergirds relational database concepts. But I’ve ...
    Posted to Rob Farley (Weblog) by rob_farley on June 9, 2014
  • SQL TuneIn Zagreb 2014 – Session material

    I spent the last few days in Zagreb, Croatie, at the third edition of the SQL TuneIn conference, and I had a very good time here. Nice company, good sessions, and awesome audiences. I presented my “Understanding Execution Plans” precon to a small but interested audience on Monday. Participants have received a download link for the slide deck. On ...
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