sql
http://nippondanji.blogspot.com/2009/03/mysqlexplain.html
http://nippondanji.blogspot.com/2009/03/using-filesort.html
http://nippondanji.blogspot.com/2009/03/mysql_25.html
http://nippondanji.blogspot.com/2009/03/mysql7.html
http://nippondanji.blogspot.com/2009/02/mysql10.html
http://nippondanji.blogspot.com/2008/12/2008.html
#sql
#mysql