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<p><b>Abstract</b>—Knowledge discovery facilitates querying database knowledge and intelligent query answering in database systems. In this paper, we investigate the application of discovered knowledge, concept hierarchies, and knowledge discovery tools for intelligent query answering in database systems. A knowledge-rich data model is constructed to incorporate discovered knowledge and knowledge discovery tools. Queries are classified into data queries and knowledge queries. Both types of queries can be answered directly by simple retrieval or intelligently by analyzing the intent of query and providing generalized, neighborhood or associated information using stored or discovered knowledge. Techniques have been developed for intelligent query answering using discovered knowledge and/or knowledge discovery tools, which includes generalization, data summarization, concept clustering, rule discovery, query rewriting, deduction, lazy evaluation, application of multiple-layered databases, etc. Our study shows that knowledge discovery substantially broadens the spectrum of intelligent query answering and may have deep implications on query answering in data- and knowledge-base systems.</p>
Database and knowledge-base systems, knowledge discovery in databases, knowledge-rich data model, intelligent query answering, multiple layered databases, query analysis and query processing.

Y. Fu, J. Han, Y. Huang and N. Cercone, "Intelligent Query Answering by Knowledge Discovery Techniques," in IEEE Transactions on Knowledge & Data Engineering, vol. 8, no. , pp. 373-390, 1996.
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