Question

我有一个名为essays的表，它与名为paragraphs的表具有1对M的关系。因此，paragraphs表的外键指向essay。

我当前遇到的问题是，如果我进行搜索，MySQL会查看每个段落，但不知道多个段落可以指向同一本书。

我的全文搜索看起来像这样：

SELECT DISTINCT *, 
 MATCH(essays.title) AGAINST('my search') as tscore,
 MATCH(paragraphs.content) AGAINST('my search') as cscore
FROM essays 
INNER JOIN paragraphs ON paragraphs.essay_id = essays.id
WHERE 
 MATCH(essays.title) AGAINST('my search')
 OR MATCH(paragraphs.content) AGAINST('my search')
ORDER BY (3 * tscore + cscore) DESC

有没有办法让MySQL在文章的所有段落中搜索某些内容，然后返回该文章？

Answer 1

这样的事情对你有用吗？

SELECT essays.id, essays.title,
   MATCH(essays.title) AGAINST('my search') as tscore,
   MATCH(paragraphs.content) AGAINST('my search') as cscore
FROM essays 
   INNER JOIN paragraphs ON paragraphs.essay_id = essays.id
GROUP BY essays.id
   HAVING tscore > 0 OR cscore > 0
ORDER BY (3 * tscore + cscore) DESC;

你也可以使用WHERE子句而不是HAVING，但是你需要：

SELECT essays.id, essays.title,
   MATCH(essays.title) AGAINST('my search') as tscore,
   MATCH(paragraphs.content) AGAINST('my search') as cscore
FROM essays 
   INNER JOIN paragraphs ON paragraphs.essay_id = essays.id
WHERE 
   MATCH(essays.title) AGAINST('my search')
   OR MATCH(paragraphs.content) AGAINST('my search')
GROUP BY essays.id
ORDER BY (3 * tscore + cscore) DESC;

请注意，使用SELECT *时不应使用GROUP BY，因为可能会出现不需要的聚合问题。

MySQL全文搜索多行

1 个答案: