Query-by-Example

This results in an advisory system where the retrieved cases are manually adapted to the current context by the user. The case reuse and the adaption are both traced for later review and repetition. To simplify the search for matching cases, the integrated tools can directlj query the experience repository based on their current situation or context. Another approach applied here is the manual building of semantic example-based queries (Query-By-Example, QBE). 

The resulting set of information views passed to contractors in earlier projects, are displayed in the PDW client. This allows to reuse them by exchanging the central concept instance (the extruder). The project, the user, and some other parameters also need to be bound according to the current situation which enables the PDW to automatically find the related data. The resulting view can be adapted, transferred, and recorded as described above. A view definition can also be derived from the view in a Query-by-Example... 

Most DBMS products allow data entry using on-screen forms, barcode readers or direct input from instmments or other devices. All DBMS systems offer ways to construct and produce output reports. Some offer custom reports using query-by-example or other easy-to-use techniques. A query allows a user to look up combinations of data element (table columns) and restrict which data records (data table rows) to include. Some allow transfer of reports to other software, such as business graphics or systems. Many DBMS products have security features that limit access to data by particular people. 

M. Zloof. Query by example A data base language. IBM Systems Journal 4(16) 324-343, 1977. 

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