Open Data
Open Data
Open Data
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Motivation – Keyword Search<br />
Querying structured data<br />
• Relational databases<br />
• A repository for a significant amount of data (e.g. enterprise data)<br />
• RDBMS that manages an abstract view of underlying data<br />
• Structured Query Language (SQL)<br />
• Precise and complete<br />
• Difficult for casual users<br />
<strong>Data</strong><br />
Structured<br />
Querying<br />
Precise<br />
Querying unstructured data<br />
• (Web) documents<br />
• Collection of unstructured (natural language) documents available online<br />
• Search engine: The most popular application for information discovery<br />
• Keyword search<br />
• Simple and user-friendly<br />
• Approximating the precise results, in statistical and semantic ways<br />
Easy way of querying<br />
structured data<br />
Unstructured<br />
Easy<br />
© Prof. Dr.-Ing. Wolfgang Lehner| Do-It-Yourself Analytics on <strong>Open</strong> <strong>Data</strong> 37