20 Foreign Key CASCADE Explained | ON DELETE & ON UPDATE CASCADE in SQL Server
Complete playlist is here: • SQL Server Basics For Beginners
In this video, you will learn how Foreign Key CASCADE works in SQL Server, including ON DELETE CASCADE and ON UPDATE CASCADE behavior.
We will see what happens when you try to delete or update parent table data and how SQL Server automatically updates or deletes related records in the child table using CASCADE.
👉 What you will learn
What is Foreign Key CASCADE in SQL Server
Difference between NO ACTION and CASCADE
How ON DELETE CASCADE works
How ON UPDATE CASCADE works
Real examples with parent & child tables
When CASCADE is dangerous
⚠️ Important Notes
CASCADE can delete multiple rows automatically
Use carefully in production systems
Always test before applying CASCADE constraints
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