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Minimum number of candidate keys for a relation?

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Lucky
Lucky 2022-9-14
I want to know if a primary key and a candidate key are required for a database relation or table. Is it feasible to create a connection where no set of qualities can be used to identify a row in a certain way?
If not, why? If so, how does a database management system (DBMS) make operations like search, delete, etc. efficient?

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