What is a primary key?
a field that uniquely identifies a record in a table
a field that uniquely identifies a table
the first security key entered by a database user
the first security key entered by a database administrator
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The correct answer is letter "A": a field that uniquely identifies a record in a table. Explanation: A primary key is a unique relational database table that is created to identify record tables. Primary keys contain a special value for each row of data and it does not include "null" data.
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Primary key
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.
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