Multitech MT56DSU-R Especificaciones descargar pdf (Pagina 47)

Chapter 2. System Training

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Field

A field is one item of information for a record. For example, the records in the

Customer Master File include customer name, address, phone number, tax type,

price level, and so forth. Each one is considered a field.

Certain fields are also identified as keys.

Key

A key is a special field (or fields) in a record used to organize the record for more

efficient retrieval. For example, the Customer Master File keys are the customer

number and customer name. The customer number and name must be unique to

each customer so it is used as the key to the record.

The Customer Master File can be

sorted by customer number or name.

Customer reports can be printed in

either customer number or name

order. Also you can enter the

customer number or name to have the

computer display further information

about that customer.

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Multitech MT56DSU-R Especificaciones Pagina 47