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प्रश्न
Mr. Rohan has created a table 'student' with rollno., name, class and section. Now he is confused to set the primary key. So identify the primary key column.
अति संक्षिप्त उत्तर
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उत्तर
rollno should be the primary key because it uniquely identifies each student record. It must contain unique and non-NULL values.
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