sql queries and relational algebra queries. using the appendix provided, write sql queries to answer each of the questions

Appendix 1. Pizza Delivery Shop DB design. Relational schemas. Customer (CustomerPhoneKey (PK), LastName, FirstName, Address1, Address2, City, State, Zip). Customer order(Orderkey [PK], OrderDate, OrderTime, CustomerPhoneKey [FK], EmployeeKeyCFK]). Employee (EmployeeKey [PK], LastName, FirstName, HireDate). Product (ProductKey (PK], ProductName, UnitSize, UnitPrice). OrderDetail (OrderDetailKey [PK], Orderkey IFK], Product Key IFK], Order DetailQuantity, OrderDetailPriceCharged)