CONCAT_WS行JOIN

Question

我有表

profiles (id, name, deleted) 
categories (id, name, deleted) 
profiles_categories (id, profile_id, category_id, , deleted) 

我錯誤查詢

SELECT p.id, p.name CONCAT_WS(', ', c.name) AS keywords_categories 
FROM profiles p 
LEFT JOIN profiles_categories pc ON p.id = pc.profile_id 
LEFT JOIN categories c ON pc.id = c.id 
WHERE p.deleted = FALSE 

所以，我想有所有profiles與concan categories.name結果。

感謝

Answer 1

這是不完全清楚，但好像你真的想使用GROUP_CONCAT這將創建一個逗號所有類別的每個配置文件的分隔列表：

SELECT p.id, 
    p.name, 
    GROUP_CONCAT(c.name SEPARATOR ', ') AS keywords_categories 
FROM profiles p 
LEFT JOIN profiles_categories pc ON p.id = pc.profile_id 
LEFT JOIN categories c ON pc.id = c.id 
WHERE p.deleted = FALSE 
GROUP BY p.id, p.name