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In relational database design, a primary key can uniquely identify each row in a table. A primary key comprises a single column or a set of columns.

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Possible Duplicate: Why use an int as a lookup table's primary key? So far, I'm accustomed to creating an ID column for every table and it is practical in a way that it makes me not think a …
asked Nov 22 '11 by Uğur Gümüşhan