MySQL全文搜索仅适用于BOOLEAN模式。 如何获得相关性？

Question

I want to search in Natural Language Mode to order results by relevancy, but my query only works with BOOLEAN Mode selector. If I use the query without BOOLEAN I get no results. Any idea why this does not work? Or idea how to get results by relevancy (most matched keywords first) with BOOELAN?

My query:

SELECT *,
MATCH(md.keywords) AGAINST('$meta[keywords]' IN BOOLEAN MODE) AS score
FROM 
meta_data AS md 
INNER JOIN
sites AS si ON md.domain = si.domain && si.domain != '$data[domain]'
WHERE
MATCH(md.keywords) AGAINST('$meta[keywords]' IN BOOLEAN MODE)
ORDER BY score Desc
LIMIT 25

Database is MyISAM and I have altered mysql table for fulltext search

FULLTEXT KEY `title` (`title`,`description`,`keywords`)

Answer 1

Change your query to

 SELECT *, MATCH(md.keywords) AGAINST('$meta[keywords]') AS score
 FROM 
 meta_data AS md 
 INNER JOIN sites AS si ON md.domain = si.domain && si.domain != '$data[domain]'
 WHERE
 MATCH(md.keywords) AGAINST('$meta[keywords]' IN BOOLEAN MODE)
 ORDER BY score DESC
 LIMIT 25

The

MATCH(md.keywords) AGAINST('$meta[keywords]') AS score

will return the relevancy score of the search term and

 ORDER BY score DESC

will display your results in descending order (ie highest score first)