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Each ai corresponds to an acribute problem denition a

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Unformatted text preview: ng 2012 •  Intra ­source duplicates –  Requires data fusion process to produce a new and enhanced single representa/on •  Inter ­source duplicates Email null [email protected] null –  Requires less data fusion processing –  Requires annota/ons on the data 15 Spring 2013 Sangmi Lee Pallickara, CS480, Spring 2012 CS480 Principles of Data Management 16 Spring 2013 Defining Duplicates •  Given an rela/on R, the schema of the rela/on as SR = <a1, a2, …, an>. –  Each ai corresponds to an acribute Problem Definition •  A record stored in a rela/on R assigns a value to each acribute.   r = <v1, v2, …, vn>: the simple lists values   r = <(a1, v1), (a2, v2), …, (an ,vn)> : acribute ­value pairs Sangmi Lee Pallickara, CS480, Spring 2012 18 3 2/19/13 CS480 Principles of Data Management Spring 2013 CS480 Principles of Data Management Example Spring 2013 Examp...
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