Comments on: MySQL Bug? http://maisonbisson.com/blog/post/12158/mysql-bug/ A bunch of stuff I would have emailed you about. Sat, 22 Nov 2008 15:47:42 +0000 http://wordpress.org/?v=2.6 By: Raffaele http://maisonbisson.com/blog/post/12158/mysql-bug/#comment-235769 Raffaele Sun, 19 Oct 2008 20:40:01 +0000 http://maisonbisson.com/blog/?p=12158#comment-235769 Hello! True! I think that is a BUG.... and a BIG bug! I have the same database in two machines: one is windows based with version 5.0.51b and it returns th BAD order, that is the ID order instead of date (in my case i had really the SAME problem as you... I need to group by due to the fact that in some cases I had joins taht multply the outputs) With Mysql 5.0.37 in SlackwareLinux that (hopefully because is "on field" machine) Did you tried with newer verions (the last one is 5.0.64)? Hello!
True! I think that is a BUG…. and a BIG bug!
I have the same database in two machines: one is windows based with version 5.0.51b and it returns th BAD order, that is the ID order instead of date (in my case i had really the SAME problem as you… I need to group by due to the fact that in some cases I had joins taht multply the outputs)
With Mysql 5.0.37 in SlackwareLinux that (hopefully because is “on field” machine)
Did you tried with newer verions (the last one is 5.0.64)?

]]> By: Casey Bisson http://maisonbisson.com/blog/post/12158/mysql-bug/#comment-195429 Casey Bisson Thu, 26 Jun 2008 03:54:32 +0000 http://maisonbisson.com/blog/?p=12158#comment-195429 @Rob Wultsch: I think you found this post within minutes of when I published it. I edited it shortly after that to show the select on both ID and post_date_gmt, which isn't how the real query is written, but I did test it that way. The result of the first query, with or without post_date_gmt is the same: I get posts returned in ascending order of post ID. @Rob Wultsch: I think you found this post within minutes of when I published it. I edited it shortly after that to show the select on both ID and post_date_gmt, which isn’t how the real query is written, but I did test it that way. The result of the first query, with or without post_date_gmt is the same: I get posts returned in ascending order of post ID.

]]> By: Rob Wultsch http://maisonbisson.com/blog/post/12158/mysql-bug/#comment-195269 Rob Wultsch Tue, 24 Jun 2008 19:43:02 +0000 http://maisonbisson.com/blog/?p=12158#comment-195269 The group by in the first query is illegal on most databases. When there is a select clause which specifies columns that are not in a group by clause, then the returned values of such columns are random randomly selected among available values. All sorts of undesirable behavior can happen due to misuse of a group by which is allowed in MySQL. My guess is that MySQL AB is not testing their builds against queries which should be illegal. The group by in the first query is illegal on most databases. When there is a select clause which specifies columns that are not in a group by clause, then the returned values of such columns are random randomly selected among available values. All sorts of undesirable behavior can happen due to misuse of a group by which is allowed in MySQL.

My guess is that MySQL AB is not testing their builds against queries which should be illegal.

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