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  • Sub query pass through

    Occasionally in forums and on client sites I see conditional subqueries in statements. This is where the developer has decided that it is only necessary to process some data under a certain condition.  By way of example, something like this : Create Procedure GetOrder @SalesOrderId integer, @CountDetails...
    Posted to SQL and the like (Weblog) by Anonymous on Fri, Mar 22 2013
  • Denali Paging–Key seek lookups

    In my previous post “ Denali Paging – is it win.win ? ” I demonstrated the use of using the Paging functionality within Denali.  On reflection,  I think i may of been a little unfair and should of continued always planned to continue my investigations to the next step. In Pauls article , he...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Fri, Nov 19 2010
  • Denali Paging–Is it win/win ?

    UPDATE : 2012-07-26 : My latest commentry of the paging subject can be found here : http://sqlblogcasts.com/blogs/sqlandthelike/archive/2012/04/26/offset-without-offset.aspx I'm not one for automatically poo-pooing new ideas, new practices and new technology. Rather I like to take a measured view...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Wed, Nov 10 2010
  • The best things in life are free

    Greg Gonzalez ( blog | twitter ) of SqlSentry , last night released a very cool new and free product.  Plan explorer is a tool for examining query plans and overcomes many of the limitations of viewing plans within Management studio.  If you view plans a lot i would recommend that you give...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Thu, Oct 21 2010
  • An impossible case

    In a previous blog entry ( Inconsistent NullIf behaviour ), Jeff Moden and Dan Halliday ( twitter ) both made a very similar observation. When executing this code Code Snippet select top ( 10 ) abs ( checksum ( newid ()))% 4 from sys . objects the only possible values returned can be 0,1,2 or 3. Anything...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Mon, Sep 6 2010
  • Inconsistent NullIF Behaviour ?

    NullIf can be a very handy function sometimes. For those who have not used it, if the result of the two parameters are equal then null is returned. So if we execute : Code Snippet Select nullif ( 10 , 10 ) as Result1 Select nullif ( 10 , 9 ) as Result2 We get the result of For some test data, I required...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Fri, Aug 6 2010
  • Using a UDF as a SARG. Make a hash of it!

    I am somewhat uncomfortable blogging this, as I feel that it falls into “Polish a turd” category. Having said that, it is a particularly ugly turd and it does polish up rather well. Though as the saying goes, it is still a turd. The evils and inadequacies of UDF (User Defined Functions) in SqlServer...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Fri, Jul 2 2010
  • SQL 101 : Without “ORDER BY”, order is not guaranteed.

    It’s as simple as that. If you don’t specify ORDER BY, then the order of your result set is not guaranteed. Oh sure , there may be situations where the data looks like it is being returned ordered, but this is not really the case. So, for example : CREATE TABLE #Example ( row_id INTEGER ); GO INSERT...
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Sun, Jun 27 2010
  • Phil Factor Speed Phreak SQL Challenge Number 3

    The latest Phil Factor challenge is now active here . The prize has now been increased to $100
    Posted to SQL and the like (Weblog) by Dave Ballantyne on Fri, Dec 4 2009
  • Phil Factor Speed Phreak SQL Challenge Number 3

    The latest Phil Factor challenge is now active here . The prize has now been increased to $100
    Posted to SQL and the like (Weblog) by Anonymous on Fri, Dec 4 2009
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