Question

* Primary key what is mean by primary key​

Answer 1

Answer:

primary key is a specific choice of a minimal set of attributes (columns) that uniquely specify a tuple (row) in a relation (table). Informally, a primary key is "which attributes identify a record", and in simple cases are simply a single attribute: a unique id.

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Answer 2

a primary key is a field whose value uniquely every record in the table the value in. the primary key field is different for every records and thus it helps so identify no field behaves a primary key because every student has a unique admission number.

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