Question

我正在研究搜索/标签系统。我写的原始查询是在我的文章/视频表中存储“标题”，“描述”和逗号分隔的“标签”列时。我已经意识到标准化我的标签的优势。我现在有三张表来处理...

tbl_Articles

的article_id
标题
描述
含量

tbl_tag_index

tag_id（代理主要身份证）
tag_type（对于tbl_Articles，等于1， 2 for 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）

此查询返回标记...只有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正常工作

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

这是我以前的旧搜索查询

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;

Answer 1

使用：

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

mysql - 返回分组在列中的结果

1 个答案: