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Query-by-Example

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Query-by-Example (QBE) [1] was a product from IBM Research in the mid 1970s. It was the first relational database management system to implement a graphical interface. There is a good article on QBE in www.cs.wisc.edu/~dbbook/openAccess/thirdEdition/qbe.pdf.

There have been several imitations of QBE, including Microsoft Query by Example.

[1] M. Zloof. Query by Example. AFIPS, 44, 1975.