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प्रश्न
Which one of the following keys is used to uniquely identify a record in a table?
पर्याय
Foreign Key
Primary Key
Composite Key
Alternate Key
MCQ
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उत्तर
Primary Key
Explanation:
A primary key is a field (or set of fields) in a table that uniquely identifies each record and does not allow duplicates or null values. It ensures that every record in the table can be uniquely retrieved, making it the main identifier for rows in a database.
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