MySQL全文搜索多行

Question

我有一个名为essays的表，该表与一个称为paragraphs的表具有1-to-M关系。 因此， paragraphs表具有指向essay外键。

我当前遇到的问题是，如果进行搜索，MySQL将查看每个单独的段落，但不知道多个段落可以指向同一本书。

我的全文搜索如下：

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

有没有一种方法可以使MySQL在论文的所有段落中搜索某些东西，然后只返回该论文？

Answer 1

这样的事情对您有用吗？

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;

您还可以使用WHERE子句代替HAVING，但是您需要：

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GROUP BY时不应使用SELECT * ，因为可能会弹出不必要的聚合问题。