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Question

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 ?

A
Unique key
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B
Prime attribute
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C
Primary key
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D
Embedded key
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Solution

The correct option is B Primary key

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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