Quote:
When MATCH() is used in a WHERE clause, as in the preceding example, the rows returned are automatically sorted with the highest relevance first.
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To change it to percentages just add the code to the SELECT list along with the WHERE clause. It also states that this causes no extra overhead as MySQL notices the two MATCH() functions and only does the fulltext search once.
Source:
http://dev.mysql.com/doc/mysql/en/fulltext-search.html