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Is there any best way to REPLACE the query?

  • September 26, 2012 at 5:27 am

    #264715

    Hi there,

    I have a below query which needs to replace the label to actual value. I can do this by using REPLACE() recursively. Is there any better way to bring the output?

    I'm getting proper output from this query, however I'm curious to find better one. Thanks!

    DECLARE @a AS VARCHAR(1000)

    SET @a = 'This is <<FirstName>> <<LastName>> FROM <<PLACE>>, MY DOB IS ON <<DATE>> at <<TIME>>. THANKS'

    SELECT REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(@A,'<<FirstName>>','LOKESH'),'<<LastName>>','GOWDA'),'<<PLACE>>','MANGALORE'),'<<DATE>>','2000-FEB-09'),'<<TIME>>','09:20pm')

    Regards,

    Lokesh GB

  • September 26, 2012 at 5:47 am

    #1542324

    Nested REPLACE is very efficient, so there will not be a faster way.

  • September 26, 2012 at 5:50 am

    #1542328

    Thanks dude 🙂

  • September 26, 2012 at 7:25 am

    #1542389

    Using Replace is good logic and it will be faster

  • September 27, 2012 at 12:03 am

    #1542709

    laurie-789651 (9/26/2012)

    Nested REPLACE is very efficient, so there will not be a faster way.

    There's nearly always a faster way:

    DECLARE @a AS VARCHAR(1000)

    SET @a = 'This is <<FirstName>> <<LastName>> FROM <<PLACE>>, MY DOB IS ON <<DATE>> at <<TIME>>. THANKS'

    SELECT REPLACE(

    REPLACE(

    REPLACE(

    REPLACE(

    REPLACE(@A COLLATE Latin1_general_bin

    ,'<<FirstName>>','LOKESH'),'<<LastName>>','GOWDA'),'<<PLACE>>','MANGALORE'),'<<DATE>>','2000-FEB-09'),'<<TIME>>','09:20pm')

    Explanation of how REPLACE is slow when using non-binary collations: http://connect.microsoft.com/SQLServer/feedback/details/512459/replace-function-extremely-slow-with-non-binary-windows-collation

    My mantra: No loops! No CURSORs! No RBAR! Hoo-uh![/I]

    My thought question: Have you ever been told that your query runs too fast?

    My advice:
    INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?
    The path of least resistance can be a slippery slope. Take care that fixing your fixes of fixes doesn't snowball and end up costing you more than fixing the root cause would have in the first place.

    Need to UNPIVOT? Why not CROSS APPLY VALUES instead?[/url]
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