mysql按相关性匹配顺序

Question

我试图根据相关性和一些顺序来命令我的结果

SELECT d.s_title, oc_t_item.*, oc_t_item.s_contact_name as s_user_name,
  MATCH (d.s_title) AGAINST ('"myvi xt"') AS exact_phrase,
  MATCH (d.s_title) AGAINST ('+myvi +xt"') AS both_keyword
FROM (oc_t_item) LEFT JOIN oc_t_item_description as d
  ON d.fk_i_item_id = oc_t_item.pk_i_id
WHERE MATCH(d.s_title) AGAINST('myvi xt' IN BOOLEAN MODE)
ORDER BY exact_phrase desc, both_keyword desc LIMIT 1000

以上查询将返回以下结果

所以问题是结果应该先用精确的短语排序，例如＆＃34; Myvi XT ＆＃34;然后按照＆＃34; Myvi一些文字XT ＆＃34;但我已经使用了ORDER BY exact_phrase desc, both_keyword desc

Answer 1

默认情况下，MySQL中全文搜索的最小字长为4个字母。这意味着忽略任何更短的东西。以下是相关的documentation：

ft_min_word_len

Command-Line Format --ft_min_word_len=#
Option-File Format  ft_min_word_len
System Variable Name    ft_min_word_len
Variable Scope  Global
Dynamic Variable    No
    Permitted Values
Type    numeric
Default 4
Min Value   1
The minimum length of the word to be included in a MyISAM FULLTEXT index.

Note
FULLTEXT indexes on MyISAM tables must be rebuilt after changing this variable. Use REPAIR TABLE tbl_name QUICK.

换句话说，除非您更改了此默认设置，否则查询中将完全忽略单词'xt'。