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This tutorial shows you how to use MySQL ON DELETE CASCADE to automatically delete data from a child table when you delete data from the parent table.
8 lut 2021 · Learn how to use ON DELETE CASCADE constraint in MySQL to delete the rows from the child table automatically when the rows from the parent table are deleted. See an example of creating and deleting tables with foreign key references and cascade action.
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. e.g. products: boots, mittens, hats, coats.
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.
CASCADE: Delete or update the row from the parent table and automatically delete or update the matching rows in the child table. Both ON DELETE CASCADE and ON UPDATE CASCADE are supported.
12 sty 2022 · Using ON DELETE CASCADE, all the related records in the child table get automatically deleted when the parent table data is deleted. The ON DELETE CASCADE helps you avoid writing nested queries for deleting the child table data respective to parent table data.
