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Data Cleaning - dbis ethz 2025

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The document discusses data cleaning within the context of data warehousing and information integration. It highlights the challenges of ensuring data quality when dealing with heterogeneous sources, including issues like duplicate entries, schema mismatches, and erroneous data. The document outlines various approaches to data cleaning, such as verification, transformation definitions, and conflict resolution. It emphasizes the importance of metadata in assessing data quality and presents techniques for reference reconciliation to identify unique real-world entities from overlapping records. Overall, it underscores that effective data cleaning is crucial for accurate decision-making in organizations.

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