Transcription of Chapter 2: Data Representation and Data Reduction
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Chapter 2: Data Representation and Data Reduction
DATABASESYSTEMSGROUPK nowledge Discovery in Databases I: data Representation1 Knowledge Discovery in DatabasesSS 2016 Lecture: Prof. Dr. Thomas SeidlTutorials: Julian Busch, Evgeniy Faerman,Florian Richter, Klaus SchmidLudwig-Maximilians-Universit t M nchenInstitut f r InformatikLehr-und Forschungseinheit f r DatenbanksystemeChapter 2: data RepresentationandData ReductionDATABASESYSTEMSGROUPO verview data Representation data types Comparisonandsimilarity data visualization data Reduction Aggregation GeneralizationKnowledge Discovery in Databases I: data Representation2 DATABASESYSTEMSGROUPO bjects carry information Objects and attributes Entity-Relationshipdiagram(ER) UML classdiagram data tables(relational model)Knowledge Discovery in Databases I: data , C,RBob1 CSJava, PHPC harly4 HistoryPiano,..Debra2 ArtsPainting, ..StudierendenamesemestermajorskillsStud ierendesemestermajorskillsnameDATABASESY STEMSGROUPO verviewof (attribute) datatypes Simple datatypes Numerical, categorical, ordinal Composeddatatypes Sets, sequences, vectors Complexdatatypes Multimedia: images, videos, audio, text, documents, web pages, etc.
DATABASE SYSTEMS GROUP Overview • Data representation – Data types – Comparison and similarity – Data visualization • Data reduction – Aggregation
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