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Chile Bulgaria Keep me logged in Login. China An index is a performance optimisation feature that enables data to be accessed faster. Romania Apr. Georgia Offering exclusive content not available on RedTube.

Lesbian 13, Videos. Belgium Recommended Videos See All. Japan All rights reserved. You tend to use the primary key as the most natural unique identifier for a row such as social security number, employee ID and so forth, although there is a school of thought that you should always use an artificial surrogate key for this.

Join RedTube Premium and never look back. Israel Website Statistics Members: 44, Active escort profiles: 9, Female users: 15, Male users: 52, TS-users: 6, Profiles with reviews: All escorts ever: 17, More site stats. Channels Recommended. OK, maybe "A primary key is always indexed, but is special as compared to an index key in that: Gabe There's no fundamental reason why a primary key MUST always be indexed, Romina Annika it's usually a good idea to.

Swarnamala - young Czech from Konstanz Germany Oct. A key minimal superkey is a set of attributes, the values of which are unique for every tuple.

Sexsy gairl Visit chat. For example, an employee database may have your employee number as the primary key but it may also have an Pisana on your last name or your department. Denmark

By clicking "Post Your Answer", you agree to our terms of serviceprivacy policy and cookie policy. TylerH A primary key is a special kind of index in that: You should mention that a primary key is always indexed, meaning that a primary key is also always an index key. Trending Searches. Post as a guest Name. Romania Apr. Linked 0.

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