mysql - 将全文搜索的分数相加 MATCH 在一起

Question

我有两个表:

表格页面:

|id |title      |
+---+-----------+
|1  |Foxes      |
|2  |Pet dogs   |

表关键字:

|id |page_id |phrase                |
+---+--------+----------------------+
|1  |1       |quick brown fox jumps |
|2  |1       |lazy dog              |
|3  |2       |caring for a dog      |
|4  |2       |pet dog               |

我目前正在使用这个查询:

SELECT pages.title, MATCH (phrase) AGAINST ('pet dog') as relevance
FROM pages
INNER JOIN keywords
ON pages.id = keywords.page_id
WHERE MATCH (phrase) AGAINST ('pet dog')
ORDER BY relevance DESC;

我得到了这个结果:

|title |relevance            |
+------+---------------------+
|Dogs  |0.3780859112739563   |
|Foxes |0.015609688125550747 |
|Dogs  |0.015609688125550747 |

但我希望每个title只有一个relevance，所以每个短语的relevance都适合每个title 应该像这样添加在一起:

|title |relevance            |
+------+---------------------+
|dogs  |0.3936955994         |
|foxes |0.015609688125550747 |

Answer 1

1. 在您的结果集中添加一个GROUP BY title 语句，这样具有相同title 的记录将被聚合到一个组中。
2. 调用 SUM 函数以获得每个组的相关性 的总和。

所以，这个查询可能会帮到你:

SELECT title, SUM(relevance)
FROM
(
  SELECT pages.title, MATCH (phrase) AGAINST ('pet dog') as relevance
  FROM pages
  INNER JOIN keywords
  ON pages.id = keywords.page_id
  WHERE MATCH (phrase) AGAINST ('pet dog')
  ORDER BY relevance DESC
)
GROUP BY title;