我想在MySQL中编写一个布尔全文搜索查询。但我希望按此顺序得到结果:
Exact Matches
> Including all the words
> Including some of the words
(>
表示更高。)
通过以下查询,我得到更高的精确匹配:
SELECT *, MATCH(name,description,address)
AGAINST('>("word1 word2 word3") <(word1 word2 word3)' IN BOOLEAN MODE)
AS score FROM samples WHERE MATCH(name,description,address)
AGAINST('>("word1 word2 word3") <(word1 word2 word3)' IN BOOLEAN MODE) ORDER BY score DESC
通过以下查询,我得到的文档包含的所有单词都高于包含查询某些部分的单词:
SELECT *, MATCH(name,description,address)
AGAINST('>(+word1 +word2 +word3) <(word1 word2 word3)' IN BOOLEAN MODE)
AS score FROM samples WHERE MATCH(name,description,address)
AGAINST('>(+word1 +word2 +word3) <(word1 word2 word3)' IN BOOLEAN MODE) ORDER BY score DESC
但我想结合这两个查询。这是迄今为止我遇到的最好的,但我没有得到我想要的结果。
SELECT *, MATCH(name,description,address)
AGAINST('>("word1 word2 word3") <(>(+word1 +word2 +word3) <(word1 word2 word3))' IN BOOLEAN MODE)
AS score FROM samples WHERE MATCH(name,description,address)
AGAINST('>("word1 word2 word3") <(>(+word1 +word2 +word3) <(word1 word2 word3))' IN BOOLEAN MODE)
ORDER BY score DESC
没有UNIONs有没有办法做到这一点?
答案 0 :(得分:1)
( SELECT *,
1 AS sort_order, -- top priority to exact match
1.0 AS extra_ordering
... WHERE txt = 'aaaa bbbb cccc' )
UNION ALL
( SELECT *,
2 AS sort_order, -- next to all words exist
MATCH(txt) AGAINST("+aaaa +bbbb +cccc" IN BOOLEAN MODE)
... WHERE MATCH(txt) AGAINST("+aaaa +bbbb +cccc" IN BOOLEAN MODE)
UNION ALL
( SELECT *,
3 AS sort_order, -- finally "any" words
MATCH(txt) AGAINST("aaaa bbbb cccc" IN BOOLEAN MODE)
... WHERE MATCH(txt) AGAINST("aaaa bbbb cccc" IN BOOLEAN MODE)
ORDER BY sort_order ASC, extra_ordering DESC
LIMIT 1; -- to get the 'best'
答案 1 :(得分:1)
这会有用吗?
SELECT *,
MATCH (name,description,address)
AGAINST ('"word1 word2 word3"' IN BOOLEAN MODE) score_exact,
MATCH (name,description,address)
AGAINST ('+word1 +word2 +word3' IN BOOLEAN MODE) score_all,
MATCH (name,description,address)
AGAINST ('word1 word2 word3' IN BOOLEAN MODE) score_some
FROM samples
WHERE MATCH (name,description,address)
AGAINST ('word1 word2 word3' IN BOOLEAN MODE)
ORDER BY score_exact DESC, score_all DESC, score_some DESC