我正在开发搜索/标签系统。我最初编写的查询是在我的文章/视频表中存储“标题”、“描述”和逗号分隔的“标签”列时执行的。从那以后,我意识到标准化标签的好处。我现在有三个表要处理...
tbl_Articles
- article_id
- 标题
- 描述
- 内容
tbl_tag_index
- tag_id(代理主 ID)
- tag_type(tbl_Articles 等于 1, 2 个用于 tbl_videos)
- tag_word_id(见下表)
- tag_target_id (article_id/video_id - 取决于 tag_type)
tbl_tag_word
- tag_word_id
- tag_word(最后是实际标签)
此查询返回标签...唯一的问题是它将它们作为不同的行返回。我想我需要将结果分组到同一行,以便我的搜索查询可以工作
SELECT *
FROM `tbl_articles` A
JOIN `tag_index` I ON A.article_id = I.tag_target_id
JOIN tag_word W ON I.tag_word_id = W.tag_word_id
WHERE I.tag_type_id = 1
这是我的旧搜索查询
SELECT *,
(
(CASE WHEN `description` LIKE '%hotel%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%london%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%lazy%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%dog%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%hotel%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%london%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%lazy%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%dog%' THEN 1 ELSE 0 END) +
(CASE WHEN `tags` LIKE '%hotel%' THEN 1 ELSE 0 END) +
(CASE WHEN `tags` LIKE '%london%' THEN 1 ELSE 0 END) +
(CASE WHEN `tags` LIKE '%lazy%' THEN 1 ELSE 0 END) +
(CASE WHEN `tags` LIKE '%dog%' THEN 1 ELSE 0 END)
) AS relevance
FROM `tbl_Articles`
WHERE `description` LIKE '%hotel%'
OR `description` LIKE '%london%'
OR `description` LIKE '%lazy%'
OR `description` LIKE '%dog%'
OR `title` LIKE '%hotel%'
OR `title` LIKE '%london%'
OR `title` LIKE '%lazy%'
OR `title` LIKE '%dog%'
OR `tags` LIKE '%hotel%'
OR `tags` LIKE '%london%'
OR `tags` LIKE '%lazy%'
OR `tags` LIKE '%dog%'
ORDER BY relevance DESC
LIMIT 0 , 10;
最佳答案
用途:
SELECT A.*,
GROUP_CONCAT(DISTINCT w.tag_word ORDER BY w.tag_word ASC SEPARATOR ',') AS tags,
COUNT(DISTINCT w.tag_word) +
(CASE WHEN `description` LIKE '%hotel%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%london%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%lazy%' THEN 1 ELSE 0 END) +
(CASE WHEN `description` LIKE '%dog%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%hotel%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%london%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%lazy%' THEN 1 ELSE 0 END) +
(CASE WHEN `title` LIKE '%dog%' THEN 1 ELSE 0 END) AS relevance
FROM tbl_articles A
JOIN tag_index I ON A.article_id = I.tag_target_id
JOIN tag_word W ON I.tag_word_id = W.tag_word_id
WHERE I.tag_type_id = 1
AND w.tag_word IN ('hotel', 'london', 'lazy', 'dog')
GROUP BY a.article_id, a.title, a.description, a.content
ORDER BY relevance DESC
关于php - mysql - 返回分组在列中的结果,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/2066789/