Question

Explain the concept of Primary key with an appropriate example in RDBMS.
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Answer 1

Answer:

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Explanation:

A primary key is a special relational database table column (or combination of columns) designated to uniquely identify each table record. A primary key is used as a unique identifier to quickly parse data within the table. ... It must contain a unique value for each row of data. It cannot contain null values

Answer 2

Explanation:

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