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FOREIGN KEY (product_id) REFERENCES products (id) ON DELETE CASCADE. ON UPDATE CASCADE. )Engine=InnoDB; This way, you can delete a product OR a category, and only the associated records in categories_products will die alongside. The cascade won't travel farther up the tree and delete the parent product/category table.
In this tutorial, you have learned how to use the MySQL ON DELETE CASCADE referential action for a foreign key to delete data automatically from the child tables when you delete data from the parent table.
As you want to modify the FK constraint by adding ON DELETE/UPDATE CASCADE, follow these steps: NUMBER 1: Right click on the constraint and click to Modify. NUMBER 2: Choose your constraint on the left side (if there are more than one).
8 lut 2021 · ON DELETE CASCADE constraint is used in MySQL to delete the rows from the child table automatically, when the rows from the parent table are deleted. For example when a student registers in an online learning platform, then all the details of the student are recorded with their unique number/id.
20 cze 2013 · ON DELETE CASCADE: if a row of the referenced table is deleted, then all matching rows in the referencing table are deleted. ON DELETE SET NULL: if a row of the referenced table is deleted, then all referencing columns in all matching rows of the referencing table to be set to null.
The MySQL ON DELETE CASCADE constraint ensures that when a row in the parent table is deleted, all related rows in the child table are automatically deleted as well. This constraint helps maintain referential integrity between two tables that are connected through a foreign key relationship.
27 sty 2024 · MySQL, one of the most popular database management systems, provides the functionality to achieve this through foreign key constraints. This tutorial is a deep dive into cascade delete in MySQL 8 and includes multiple practical examples to guide you from basic to advanced usages.
