本文介紹了在 MySQL 中使用 Join 刪除的處理方法,對大家解決問題具有一定的參考價值,需要的朋友們下面隨著小編來一起學習吧!
問題描述
這是創建我的表的腳本:
Here is the script to create my tables:
CREATE TABLE clients (
client_i INT(11),
PRIMARY KEY (client_id)
);
CREATE TABLE projects (
project_id INT(11) UNSIGNED,
client_id INT(11) UNSIGNED,
PRIMARY KEY (project_id)
);
CREATE TABLE posts (
post_id INT(11) UNSIGNED,
project_id INT(11) UNSIGNED,
PRIMARY KEY (post_id)
);
在我的 PHP 代碼中,刪除客戶端時,我想刪除所有項目帖子:
In my PHP code, when deleting a client, I want to delete all projects posts:
DELETE
FROM posts
INNER JOIN projects ON projects.project_id = posts.project_id
WHERE projects.client_id = :client_id;
posts 表沒有外鍵 client_id
,只有 project_id
.我想刪除項目中傳遞了 client_id
的帖子.
The posts table does not have a foreign key client_id
, only project_id
. I want to delete the posts in projects that have the passed client_id
.
這現在不起作用,因為沒有帖子被刪除.
This is not working right now because no posts are deleted.
推薦答案
您只需要指定要從 posts
表中刪除條目:
You just need to specify that you want to delete the entries from the posts
table:
DELETE posts
FROM posts
INNER JOIN projects ON projects.project_id = posts.project_id
WHERE projects.client_id = :client_id
有關更多信息,您可以查看此替代答案
For more information you can see this alternative answer
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