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职业迁徙
个人简介
My research is mainly in two areas of information systems:
Semi-structured databases (e.g., XML and Web databases) often contain incomplete data. The user's knowledge of the structure of such databases is often partial or incorrect. My research focuses on defining query languages that compensate for these problems by returning answers with different degrees of flexibility (e.g., EquiX, XSQL, XSearch) and on fundamental problems that arise in this context.
A trend toward data warehousing, i.e., storing huge amounts of detailed historical data has recently emerged. The sheer mass of the data being stored leads to immense difficulties when attempting to efficiently access the information. Since data warehouses are usually accessed by aggregate queries, an understanding of aggregate query optimization is needed. My contributions include characterizing equivalence for varied aggregate queries and defining query rewriting techniques.
Teaching:
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