👀 Views: 2 💬 Answers: 1 📅 Created: 2025-06-11

mysql foreign-key cascading-deletes SQL

I recently switched to I'm testing a new approach and I'm trying to debug I'm working on a project and hit a roadblock..... I am experiencing issues with FOREIGN KEY constraints in MySQL 8.0. I have set up a parent and child table where I expect cascading deletes to work, but they are not functioning as intended. Here’s the setup: ```sql CREATE TABLE parent ( id INT AUTO_INCREMENT PRIMARY KEY, name VARCHAR(50) ); CREATE TABLE child ( id INT AUTO_INCREMENT PRIMARY KEY, parent_id INT, value VARCHAR(50), FOREIGN KEY (parent_id) REFERENCES parent(id) ON DELETE CASCADE ); ``` After inserting some data: ```sql INSERT INTO parent (name) VALUES ('Parent 1'); INSERT INTO child (parent_id, value) VALUES (1, 'Child 1'), (1, 'Child 2'); ``` I expect that when I delete a row from the `parent` table, the corresponding rows in the `child` table should also be removed. However, when I execute the delete command: ```sql delete from parent where id = 1; ``` The rows in the `child` table remain intact. I have also checked the foreign key constraints with: ```sql SHOW CREATE TABLE child; ``` The output shows that the constraint is in place as expected. I’ve confirmed that there are no existing transactions that might be holding locks. My MySQL configuration doesn't seem to indicate any issues either. I have tried restarting the MySQL server, and I confirmed that the InnoDB engine is being used for both tables. I also experimented with removing and re-adding the foreign key constraint, but that didn’t help either. Does anyone have insights into why cascading deletes might not be functioning as expected in my scenario? Are there any particular settings or configurations that I might be missing, or could there be a bug in MySQL 8.0? My development environment is Windows. Has anyone else encountered this? I'm using Sql 3.9 in this project. Thanks, I really appreciate it! For reference, this is a production CLI tool. Any help would be greatly appreciated!