релевантность ф-цией возвращается
SELECT id, body, MATCH (title,body) AGAINST ('Security implications of running MySQL as root') AS score
FROM articles WHERE MATCH (title,body) AGAINST
('Security implications of running MySQL as root') ORDER BY score DESC;
score - это как раз и есть "релевантность"
конструкция регистронезависима
"By default, the search is performed in case-insensitive fashion. In MySQL 4.1 and up, you can make a full-text search by using a binary collation for the indexed columns."
надо переводить ?