How do you declare an alternate key?

Question

The UNIQUE keyword is used to define the alternate key, which indicates the value must be unique. Simple words to say Candidate keys that are not selected as primary key are called Alternate key. UNIQUE (col1,col2…n);

How do you define alternate key?

An alternate key (Alt key) is a key that is present on most computer keyboards and is considered a modifier key that can used similarly to the shift or control keys. In other words, the alternate key provides alternate input and operations when pressed in combination with other keys.

What is alternate key example?

All the keys which are not primary key are called an Alternate Key. Example: In this table, StudID, Roll No, Email are qualified to become a primary key. But since StudID is the primary key, Roll No, Email becomes the alternative key.

How do I create an alternate key in Oracle?

An alternate key (or secondary key) is any candidate key which is not selected to be the primary key (PK). You cant create an alternate key in Oracle, its just conceptual.

What is an alternate key in access?

Alternate keys correspond to unique customer identifiers in a third-party system. A student number from a student information system is one common alternate key type. You can use alternate keys to grant access to facilities at entry points in a similar way that you can with memberships.

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