What is a secondary key in a database?
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An entity may have one or more choices for the primary key. Collectively these are known as candidate keys. One is selected as the primary key. Those not selected are known as secondary keys. For example, an employee has an employee number, a National Insurance (NI) number and an email address.
2023-05-10 16:08:37
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An entity may have one or more choices for the primary key. Collectively these are known as candidate keys. One is selected as the primary key. Those not selected are known as secondary keys. For example, an employee has an employee number, a National Insurance (NI) number and an email address.
