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مشخصات فرکانس جدید کانال فارسی ۱ – Farsi 1 27 آگوست 2010 ...
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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For many terms, it is often completely acceptable to choose freely among open, hyphenated, and closed alternatives, even though the term has been used in English for an extended period (for instance, ).
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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