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

identify primary key

Record Type:

Accounts payable
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

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