Open Data
Open Data
Open Data
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CrowdDB<br />
Company_Name Address Market_Cap<br />
Google Googleplex, Mnt. View CA $210Bn<br />
Intl. Business Machines Armonk, NY $200Bn<br />
Microsoft Redmond, WA $250Bn<br />
SELECT Market_Cap<br />
FROM Companies<br />
WHERE Company_Name=“IBM“<br />
SELECT Market_Cap<br />
FROM Companies<br />
WHERE Company_Name=“Apple“<br />
Result: 0 rows<br />
Problem: Entity Resolution<br />
Result: 0 rows<br />
Problem: Closed World Assumption<br />
Hard queries for computers, very easy for humans<br />
© Prof. Dr.-Ing. Wolfgang Lehner| Do-It-Yourself Analytics on <strong>Open</strong> <strong>Data</strong> 27
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