Delete challenges

the speaker explains the one-to-many relationship between manufacturer and product tables. They demonstrate deleting a product, confirming the successful removal of a child record. An integrity constraint error occurs when trying to delete a parent record, highlighting the foreign key violation. The video introduces two options for handling deletions: "on delete cascade" (which deletes both parent and child records) and "on delete set null" (which sets child records to null). Practical examples illustrate how each option affects the records in the tables.