This question is from my database class; using SQL In this part we create a smal

Question

This question is from my database class;

using SQL

In this part we create a small procedure:

Write a procedure that has as input the customer_id. Then the procedure should delete the corresponding customer from table customers.

Notice that customer_id is a foreign key on table orders. Therefore the customer cannot be deleted if he has placed orders. To delete a record from customers you should first delete the corresponding orders and to do that you need to first delete the corresponding order_details.

Now execute the procedure to delete customer with id 1. If you have solved part 01 a record will be inserted into Customer_Archives.

ROLLBACK; and all these changes will be undone!

Explanation / Answer

Answer is as follows:

CREATE OR REPLACE PROCEDURE Cust_Del ( Cust_Id IN NUMBER)
BEGIN
delete from order_details
where order_id in
( select order_id from orders where cust_id = p_cust_id );

delete from orders
where cust_id = p_cust_id;
  
delete from customers where cust_id = p_cust_id;
END;

CALL Cust_Del(01);

if there is any query please ask in comments....

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