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Primary key

In database design, a primary key is a value that can be used to look up a particular row in a table. Examples are names in a telephone book (to look up telephone numbers), words in a dictionary (to look up definitions), and Dewey Decimal Numbers (to look up books in a library).

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Brazil

... is characterised by the extensive low-lying Amazon Rainforest in the north, and a more open terrain of hills and (low) mountains to the south, home to most of Brazil's ...