Query Performance - Advice needed on small query -- plan attached

• Sean Lange

  SSC Guru

  Points: 286590

  More actions

  December 13, 2012 at 10:39 am

  #1568403

  Michael T2 (12/13/2012)

  ---

  using that, i still have the table scans. if i only use

  and (txSubtype > 'BACKORDER'

  or txSubtype < 'BACKORDER'

  then the scans go away.Strange.

  I am going to read up on sargable now.

  Also the <> will produce scans.

  _______________________________________________________________

  Need help? Help us help you.

  Read the article at http://www.sqlservercentral.com/articles/Best+Practices/61537/ for best practices on asking questions.

  Need to split a string? Try Jeff Modens splitter http://www.sqlservercentral.com/articles/Tally+Table/72993/.

  Cross Tabs and Pivots, Part 1 – Converting Rows to Columns - http://www.sqlservercentral.com/articles/T-SQL/63681/
  Cross Tabs and Pivots, Part 2 - Dynamic Cross Tabs - http://www.sqlservercentral.com/articles/Crosstab/65048/
  Understanding and Using APPLY (Part 1) - http://www.sqlservercentral.com/articles/APPLY/69953/
  Understanding and Using APPLY (Part 2) - http://www.sqlservercentral.com/articles/APPLY/69954/

• dave hants

  Default port

  Points: 1485

  More actions

  December 14, 2012 at 6:29 am

  #1568666

  Michael T2 (12/13/2012)

  ---

  using that, i still have the table scans. if i only use

  and (txSubtype > 'BACKORDER'

  or txSubtype < 'BACKORDER'

  then the scans go away.Strange.

  I am going to read up on sargable now.

  It won't be once you've read up on sargable... 🙂

  This may help:

  http://vadivel.blogspot.co.uk/2011/11/what-does-avoid-non-sargable-where.html

  Regards,

  Dave.