On May 1, 10:38 am, Moodang <[email protected]> wrote:
> According to MySQL doc, I must use union and temporary tables.
>
> It seems I have to do something along the line of this:
>
> http://www.ricroberts.com/articles/2007/09/25/mysql-temporary-tables-...
>
> There are cases where I use OR queries quite often. I am talking about
> queries like this "where column_1 = 123 OR column_2 = 123". It seems
> MySQL indices cannot properly optimize this.
I don't think that's quite true - on mysql5 it should be able to do an
index merge:
http://dev.mysql.com/doc/refman/5.0/en/index-merge-optimization.html
Fred
>
> Are there plugins or snippets out there that automagically hide the
> complexity of using temporary tables for such queries?
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "Ruby
on Rails: Talk" group.
To post to this group, send email to [email protected]
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en
-~----------~----~----~----~------~----~------~--~---
