Question: 5- Write a SQL query to change the contact number of customer 103 to 40.22.2455 6-Write a SQL query to delete employees with ID 1056

5- Write a SQL query to change the contact number of customer 103 to 40.22.2455

6-Write a SQL query to delete employees with ID 1056 and 1076.

7-Write a SQL query to delete customers who have not placed any orders.

8-Write a SQL query to delete products that have not been ordered by any customers.

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