(QBE) A user-friendly query language developed by Moshé Zloof of IBM in 1975.

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[Moshé M. Zloof, "Query By Example", AFIPS NCC 1975: 431-438].

[Moshé M. Zloof, "Query-by-Example: A Data Base Language", IBM Systems Journal 16(4): 324-343, 1977].

["QBE/OBE: A Language for Office and Business Automation", M.M. Zloof, Computer pp.13-22, May 1981].