Question: When using the add_customer_service() function, what lines in exam3_insert_funcs.sql will handle the case where the customer is not already stored in the customers table? What

When using the add_customer_service() function, what lines in exam3_insert_funcs.sql will handle the case where the customer is not already stored in the customers table? What will prevent a customer from being added more than once to the customers table.

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