Answer:
Create table vendor(vendor_id int,due_invoice int,invoiceTotal int);
Create view v as select vendor_id,max(due_invoice) as unpaid from vendor;
Select sum(unpaid) from v;
Select vendor_id,invoiceTotal from vendor group by vendor_id;
Answer:
using more than one medium of expression or communication
The advantage does of ExpressCard modules and U.S.B adapters offer over expansion cards is that it can connect a variety of devices to a computer. The technical standard of ExpressCard specifies the design of slots built into the computer and of expansion of cards to insert in the slots including the mobile broadband modems. It is sometimes connectors for externals devices such as flash drives, USB connectors and other ports that need to connect to the computer.
