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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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I got a little confused by all these keys. As I understand A key of a relational schema = The minimal subset of a superkey that is still a key = A candidate key Is this correct or not?
asked May 17 '13 by Rayhunter
4
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Just found out very neat explanation: superkey: a set of attributes which will uniquely identify each tuple in a relation candidate key: a minimal superkey primary key: a chosen candidate key seco …
answered May 18 '13 by Rayhunter