Hi! This came up on my radar: http://mysqlmaniac.com/2012/what-about-the-subqueries/ MariaDB does wonderfully for Q1, but not so well for Q2 on some specific queries. These were made with the MediaWiki extension called DynamicPageList (http://www.mediawiki.org/wiki/Extension:DynamicPageList_%28third-party%29) -- Colin Charles, http://bytebot.net/blog/ | twitter: @bytebot | skype: colincharles MariaDB: Community developed. Feature enhanced. Backward compatible. Download it at: http://www.mariadb.org/ Open MariaDB/MySQL documentation at the Knowledgebase: http://kb.askmonty.org/