CREATE TABLE `ci_articles` (
`id` int(11) NOT NULL auto_increment,
`title` varchar(255) default NULL,
`content` longtext,
`date` int(11) default NULL,
`author` varchar(255) default NULL,
`cat` int(11) default NULL,
`is_page` tinyint(4) default NULL,
`permalink` varchar(255) default NULL,
`page_desc` varchar(255) default NULL,
`page_key` varchar(255) default NULL,
PRIMARY KEY (`id`),
FULLTEXT KEY `title` (`title`,`page_key`,`page_desc`,`permalink`)
) ENGINE=MyISAM AUTO_INCREMENT=31 DEFAULT CHARSET=utf8
running the query
SELECT * FROM ci_articles WHERE MATCH(title, page_key) AGAINST('sasa')
produces
Error Number: 1191
Can't find FULLTEXT index matching the column list