Computer Science for IGCSE & O level - Hardware (Section 26 - No. 28)
What is the purpose of the 'key field' in the context of barcode scanners used in a stock system?
To encrypt the barcode data for security.
To identify the item's price.
To uniquely identify the stock item in the stock database.
To store the number of items in stock.
Explication
The key field is the identifier in the stock database.