Question

What is the difference between primary and secobdady keyz in database​

Answer 1

Primary Key: Is a single field chosen by the designer to uniquely identify a record in a table (relation), cannot be null (empty/unassigned). ... Secondary (or Alternative) Key: Is any field in the table that isn't selected to be any of the two types above.

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Answer 2

What is the difference between primary and secobdady keyz in database