Comments on: How to find the max row per group in SQL without subqueries http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/ Stay curious! Thu, 09 Feb 2012 20:41:20 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: David Kleszyk http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/#comment-19835 David Kleszyk Sat, 14 Jan 2012 21:03:43 +0000 http://www.xaprb.com/blog/?p=307#comment-19835 Stumbled on this after being stymied by MySQL 3.23's lack of sub-queries. Extremely helpful, thanks so much! Stumbled on this after being stymied by MySQL 3.23′s lack of sub-queries. Extremely helpful, thanks so much!

]]> By: Thomas http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/#comment-19402 Thomas Thu, 09 Jun 2011 21:09:44 +0000 http://www.xaprb.com/blog/?p=307#comment-19402 As a followup, because it took me a few minutes before the facepalm. If you wanted the youngest, coolest kid, because you have multiple kids of the same age (assuming a coolness column), you'd change the join to: left outer join person as younger on younger.gender = young.gender and (younger.age young.coolness)) As a followup, because it took me a few minutes before the facepalm. If you wanted the youngest, coolest kid, because you have multiple kids of the same age (assuming a coolness column), you’d change the join to:

left outer join person as younger on younger.gender = young.gender
and (younger.age young.coolness))

]]> By: Anonymous http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/#comment-18998 Anonymous Tue, 21 Dec 2010 19:38:32 +0000 http://www.xaprb.com/blog/?p=307#comment-18998 Thank you so much for this post. The solution I was using with subqueries was horribly inefficient but this did the trick. As you said, it's surprisingly fast too. Thank you so much for this post. The solution I was using with subqueries was horribly inefficient but this did the trick. As you said, it’s surprisingly fast too.

]]> By: Ali desitero http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/#comment-18975 Ali desitero Tue, 07 Dec 2010 13:31:21 +0000 http://www.xaprb.com/blog/?p=307#comment-18975 PERFECT! After spending hours and hours and trying many many different queries, this solution work perfect for me. very fast on a standart pc with 30.000 rows. Only 0.0399 secs. Good job! PERFECT!

After spending hours and hours and trying many many different queries, this solution work perfect for me.

very fast on a standart pc with 30.000 rows. Only 0.0399 secs.

Good job!

]]> By: arun http://www.xaprb.com/blog/2007/03/14/how-to-find-the-max-row-per-group-in-sql-without-subqueries/#comment-18602 arun Thu, 02 Sep 2010 16:51:36 +0000 http://www.xaprb.com/blog/?p=307#comment-18602 the last query and its output do not match ... the last age column in output should not be there the last query and its output do not match … the last age column in output should not be there

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