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Exercises - web.cs.ucla.edu

Exercises9personownscarparticipatedaccid entaddressdamage-amountmodelyearlicensen amereport-numberdatelocationdriver-iddri verFigure for a Car-insurance the distinctions among the terms primary key, candidate key, and :Asuperkeyis a set of one or more attributesthat, taken collectively, al-lows us to identify uniquelyan entityin the entity set. A superkeymay containextraneous attributes. IfKis a superkey, then so is any no proper subsetis also a superkeyis called that severaldistinct sets of attributescould serve as candidatekeys. Theprimary keyis one of the candidate keys that is chosen by the database designeras the principal means of identifying entitieswithin an entity anE-Rdiagram for a car-insurance company whose customers ownone or more cars each.

it is easier to use and easier to change. Deciding between an attribute and an entity set to represent an object, and deciding between an entity set and relationship set, in˜uence the accuracy with which the real-world concept is expressed. If the right design choice is not made, inconsistency and/or loss of information will result.

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