The key that differentiates the records in a file
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Explanation:
Such a key is called primary key. A primary key is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number.
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COMPUTER SCIENCE
In files, there is a key associated with each record which is used to differentiate among different records. For every file there is at least one set of keys that is unique. Such a key is called ?
December 26, 2019
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Sakalabhaktula Babariya
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In files, there is a key associated with each record which is used to differentiate among different records. For every file there is at least one set of keys that is unique. Such a key is called primary key.
A primary key is a key in a relational database that is unique for each record. It is a unique identifier, such as a driver license number, telephone number (including area code), or vehicle identification number. A relational database must always have one and only one primary key.
A primary key's main features are: It must contain a unique value for each row of data. It cannot contain null values.
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