all records in a file must be uniquely identiied in at least one attribute which is its primary key.

Question

identify primary key

Record Type:

Accounts payable
Inventory
Customer Sales Orders
Purchase Orders to Vendors
Cash Receipts (checks) from Customers
Cash Disbursements (checks) to Vendors
Employee Payroll Earnings Records

EX. Record Type ----Primary Key

Accounts Rec.--- Customer Number