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why hello there everybody today I will be explaining the on delete Clause thereamp;#39;s two versions on delete Sentinel and on delete Cascade with on delete set null when a foreign key is deleted we can replace the foreign key with the value no otherwise thereamp;#39;s on delete Cascade when a foreign key is deleted delete the entire row hereamp;#39;s an example letamp;#39;s take a look at our table transactions select all from transactions in my transactions table the customer ID column is the foreign key what would happen if I were to delete one of these customers letamp;#39;s select all from our customers table Iamp;#39;m going to delete poppy puff she has a customer ID of four delete from customers where customer ID equals four if you run into this error cannot delete or update a parent row a foreign key constraint fails thereamp;#39;s a foreign key thatamp;#39;s preventing us from deleting this customer because this customer is used elsewhere in a different table like tha
