in and not in question

• ChrisM@Work

  SSC Guru

  Points: 186127

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  April 3, 2008 at 4:15 am

  #797700

  Adam Haines (4/2/2008)

  ---

  This is similar and may in some cases work faster:

  SELECT a.id

  FROM tblA a

  LEFT OUTER JOIN tblB b

  ON b.id = a.id

  WHERE b.id IS NULL

  Yes it is. This is the method I usually use but I felt like posting some SQL 2005 exclusive code :).

  You will also not that the left outer join is not always faster than using an in clause. As with most things, it depends.

  Heh heh Oh yes...always test! 😀

  ^{“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