Supporting Keyword Search over Structured Data

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Enabling users to access databases using simple keywords can relieve them from the trouble of mastering a structured query language and understanding complex and possibly fast evolving database schemas. Although keyword search technology has matured in the Web arena, supporting keyword search over structured data, such as the data stored in databases and data warehouses, presents unique challenges. When performing keyword search over structured data, the results are no longer existing Web pages, but "virtual documents" composed by assembling the keyword-matching tuples from (potentially) different tables. Correspondingly, the space that must be explored during search becomes much larger than that encountered in Web search.