VirtualDatabases-1

VirtualDatabases-1 - 1 CS345 Data Mining Virtual Databases...

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Unformatted text preview: 1 CS345 Data Mining Virtual Databases Example ¡ Find marketing manager openings in Internet companies so that my commute is shorter than 10 miles. Web Structured queries e.g., in SQL Virtual Relations Applications ¡ Comparison shopping ¢ shopping.com, fatlens, mobissimo,… ¡ Job search ¢ indeed.com, simplyhired,… ¡ Classifieds Search ¢ oodle ¡ Integrating web data with relational enterprise apps ¢ purchasing, pricing,… Wrappers ¡ Extract tuples from a single website ¡ Assume website is a static collection of pages i.e., no forms Website Wrapper Relation Not same as Relation Extraction ¡ Why can’t we use DIPRE or Snowball? ¢ Can’t assume that the same tuple can be found on many different websites ¢ Need to extract all the tuples from each website ¢ May need to normalize data values across websites ¢ Data may be behind forms ¡ Need to account for query capabilities of websites Brute force approach ¡ Write a custom program tailored to the website ¢ e.g., in perl, python,…e....
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VirtualDatabases-1 - 1 CS345 Data Mining Virtual Databases...

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