Super key
From Oracle FAQ
A super key is a column or set of columns that uniquely identifies a row within a table.
Example[edit]
Given table: EMPLOYEES{employee_id, firstname, surname, sal}
Possible superkeys are:
- {employee_id}
- {employee_id, firstname}
- ...
- (employee_id, firstname, surname, sal}
Only the the minimal superkey - {employee_id} - will be considered as a candidate key.
Also see[edit]
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