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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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Islandia, New York

... 25.2% are non-families. 18.8% of all households are made up of individuals and 2.3% have someone living alone who is 65 years of age or older. The average household size ...