这是创建我的表的脚本:
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代码中,删除客户端时,我要删除所有项目帖子:
DELETE
FROM posts
INNER JOIN projects ON projects.project_id = posts.project_id
WHERE projects.client_id = :client_id;
posts表没有外键
client_id
,只有project_id
。我想删除已通过client_id
的项目中的帖子。现在无法正常工作,因为没有帖子被删除。
最佳答案
您只需要指定要从posts
表中删除条目:
DELETE posts
FROM posts
INNER JOIN projects ON projects.project_id = posts.project_id
WHERE projects.client_id = :client_id
编辑:有关更多信息,您可以看到this alternative answer
关于mysql - 在MySQL中加入联接删除,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/53199997/