Abstract
Companies, government agencies, and other types of organizations are making their large databases available to the world over the Internet. The front-ends of current databases do not give the users information about the distribution of data. This leads to the wastage of time and network resources, posing queries that have either zero-hit or mega-hit result sets. Query previews form a novel visual approach for browsing large databases. They supply data distribution information about the database that is being searched and give continuous feedback about the size of the result set for the query as it is being formed. Query previews show the contents of a database during the query formulation process. To guide the users in the query formulation process, query previews provide aggregate information on some preselected attributes of the data. Query previews only need aggregate information about the database. The data distribution information is represented with multidimensional histograms.
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