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To add "Cascade delete" to an existing foreign key in SQL Server Management Studio: First, select your Foreign Key, and open it's "DROP and Create To.." in a new Query window. Then, just add ON DELETE CASCADE to the ADD CONSTRAINT command: And hit the "Execute" button to run this query.
3 lip 2019 · In this article, we will review on DELETE CASCADE AND UPDATE CASCADE rules in SQL Server foreign key with different examples. DELETE CASCADE : When we create a foreign key using this option, it deletes the referencing rows in the child table when the referenced row is deleted in the parent table which has a primary key.
Use cascade delete where you would want the record with the FK to be removed if its referring PK record was removed. In other words, where the record is meaningless without the referencing record. I find cascade delete useful to ensure that dead references are removed by default rather than cause null exceptions.
1 sie 2012 · This tip will look at the DELETE CASCADE option when creating foreign key constraints and how it helps keep the referential integrity of your database intact.
30 gru 2023 · The ON DELETE CASCADE option in PL/SQL is used to automatically delete rows from a child table when the corresponding row in the parent table is deleted. This feature helps maintain referential integrity by ensuring that related records in child tables are removed in sync with changes in the parent table.
Using the DELETE CASCADE option in your foreign key constraint definitions means better performance and less code when removing records from tables that have a parent-child relationship defined.
16 sie 2023 · The ON DELETE CASCADE feature in SQL allows you to delete child rows when a parent row is deleted. Learn all about it in this guide.
