Question

我的网站上需要Mysql全文搜索实现。我的意图是，如果用户输入搜索词，大多数相关结果应该首先出现，其他结果应该是下一步。

SELECT pr.*
, MATCH (pr.title) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) AS relevance_1
, MATCH (pr.description, pr.tags) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) AS relevance_2
, MATCH (category.name, category.description) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) AS relevance_3
FROM products AS pr
LEFT JOIN category ON category.id = pr.category_id
WHERE MATCH (pr.title, pr.description, pr.tags, category.name, category.description) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE)
ORDER BY (relevance_1 * 3) + (relevance_2 * 2) + relevance_3 DESC

这是我的sqlfiddle link。

Answer 1

在全文搜索中，您需要在您的小提琴中使用FULLTEXT索引我可以看到表products有2个索引，而对于您有3个复合索引的产品，其他一个category列title, description, tags和类别，你有复合索引涉及2列，在你的select语句中你引用一个列标题（别名为relev_1），这将导致错误

无法找到与列列表匹配的FULLTEXT索引

因为它无法仅为标题列找到索引，因此您必须指定MATCH()语句中定义了全文索引的所有列，与WHERE子句相同的问题其中包括来自表格产品的3列和来自类别的2列，您已在单个MATCH语句中定义它们

MATCH（pr.title，pr.description，pr.tags，category.name， category.description）

这又是错误的，您必须根据全文索引定义指定2个匹配语句，这些匹配语句的条件取决于您希望它们如何使用AND/OR

所以最终的工作查询将类似于

SELECT pr.*
, MATCH (pr.title,pr.description, pr.tags) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) AS relevance_2
, MATCH (category.name, category.description) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) AS relevance_3
FROM products AS pr
LEFT JOIN category ON category.id = pr.category_id
WHERE MATCH (pr.title, pr.description, pr.tags) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE)
OR 
MATCH (category.name, category.description) AGAINST ('Samsung Galaxy S6' IN BOOLEAN MODE) 
ORDER BY (relevance_2 * 2) + relevance_3 DESC

DEMO

Mysql全文搜索按相关性排序结果匹配的参数不正确

1 个答案: