Write relational expressions to accomplish these tasks. Use the same database from Appendix B$.$

Retrieve the company name, contact, and email of all domestic $($USA$)$ customers.

Retrieve the company name, contact, and email of all customers who have ever placed an order.

Retrieve the company name, contact, email, order date, quantity, and price for all customers with all orders.

$\backslash$pi CustomerName $<--\backslash$sigma Customers

$\backslash$pi CustomerName $<--$ Customers $$CustomerId Orders

$\backslash$pi CustomerName $<--$ Customers $$CustomerId Orders $$OrderId OrderDetails

Is this correct?