Exercises 1. Design a database diagram for a product orders database with four tables. Indicate the relationships between tables and identify the primary key and foreign keys in each table. Explain your design decisions. Customers Orders OrderLineltems CustomerID CustomerName Customer Address CustomerPhone OrdersID CustomerID Order Date ShipAddress Ship Date OrderID Order Sequence ProductID Quantity UnitPrice Products ProductID ProductName QtyPerUnit Unit Price InStock OnOrder 2. Add the two tables below into the design for exercise 1. Create additional tables and columns, if necessary. Explain your design decisions. Shippers Employees ShipperID EmployeeID Shipper Name FirstName ShipperAddress LastName Shipper Phone SSN Hire Date 3. Modify your design for exercise 2 to identify the columns that should be indexed, and explain your decision. 4. Design a database diagram that allows individuals to be assigned membership in one or more groups. Each group can have any number of individuals and each individual can belong to any number of groups. Create additional tables and columns, if necessary. Explain your design decisions. 5. Modify your design for exercise 4 to keep track of the role served by each individual in each group. Each individual can only serve one role in each group. Each group has a unique set of roles that members can fulfill. Create additional tables and columns, if necessary. Explain your design decisions