14-Nov-2019 18:54

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Candidate keys are a fundamental concept in the relational data model.

It's common practice, if multiple keys are present in one table, to designate one of the candidate keys as the primary key.

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However the Physical Model for our tables will in many instances be inefficient without a Surrogate Key.

Recall that non-covered columns for a non-clustered index can only be found (in general) through a Key Lookup into the clustered index (ignore tables implemented as heaps for a moment).

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