mysql搜索查詢一對多表

Question

我有兩個表（_video，_video_tag）像這樣。

我如何構建一個最佳搜索查詢？

我想在這個領域（標題，描述，標籤）

mysql> describe _video; 
+-------------+---------------+------+-----+-------------------+----------------+ 
| Field  | Type   | Null | Key | Default   | Extra   | 
+-------------+---------------+------+-----+-------------------+----------------+ 
| id   | int(11)  | NO | PRI | NULL    | auto_increment | 
| user_id  | int(11)  | NO | MUL | NULL    |    | 
| image  | varchar(255) | NO |  | NULL    |    | 
| source  | varchar(255) | YES |  | NULL    |    | 
| duration | int(11)  | NO |  | NULL    |    | 
| title  | varchar(255) | NO |  | NULL    |    | 
| slug  | varchar(255) | NO |  | NULL    |    | 
| description | text   | NO |  | NULL    |    | 
| order  | int(11)  | NO |  | 0     |    | 
| hit   | int(11)  | NO |  | 1     |    | 
| status  | enum('0','1') | NO |  | 1     |    | 
| date_add | timestamp  | NO |  | CURRENT_TIMESTAMP |    | 
+-------------+---------------+------+-----+-------------------+----------------+ 

mysql> select * from _video_tag limit 5; 
+----------+------------------------------------+ 
| video_id | tag        | 
+----------+------------------------------------+ 
| 17748 | cevahir almanca dersi    | 
| 17748 | genis aile       | 
| 17748 | ulvi        | 
| 17748 | cevahir       | 
| 17749 | oyle bir geçer zamanki 
+----------+------------------------------------+ 

Answer 1

這取決於你想要得到什麼搜索，提供哪些信息。不過，我假設您想在_video_tag中獲得給定信息from _video的特定標籤。然後，你做

select v.* from _video_tag as vt left join _video as v on v.id = vt.video_id where vt.tag = 'Specify tag';

Answer 2

如果你的表是MyISAM的最好的可擴展的方式是讓在標題和描述一個FULLTEXT指數_視頻表：

CREATE FULLTEXT INDEX title_desc ON _video(title, description) 

和一個在_video_tag表標籤欄：

CREATE FULLTEXT INDEX tag ON _video_tag(tag) 

，然後查詢這樣的：

(SELECT *, 
    MATCH(title, description) AGAINT('some query string') AS relevance 
    FROM _video 
    WHERE MATCH(title, description) AGAINT('some query string')) 
UNION 
(SELECT v.* 
    MATCH(vt.tag) AGAINST('some query string') AS relevance 
    FROM _video_tag AS vt 
    INNER JOIN _video AS v ON(v.id = vt.video_id) 
    WHERE MATCH(vt.tag) AGAINST('some query string')) 
ORDER BY relevance DESC