Question

what is primary key?

Answer 1

a primary key is relational database table coloumn combination of coloumn

Answer 2

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$<b><i>$!=!=!=!=!=!=!=!=!=!=!=!=!

PRIMARY KEY : It is a field that unique identifies a row or record in a table.

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Features of Primary Key :

▪◽♦It doesn't accept null values.

▪◽♦It doesn't accept duplicate values.

!=!=!=!=!=!=!=!=!=!=!=!=!=!=!=!


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