This thesis effort developed a user-oriented query language interface, patterned after IBM's Query-by-Example, for the Mistress relational database. The interface, Mistress/QBE, is written entirely in C and uses the UNIX curses library of subroutines to allow full screen input and output. Mistress /QBE allows the user to issue commands to draw pictorial representations of tables which exist in the database. The user then enters values and operators into the tables to specify a query by indicating attributes to be used in conditional selections, sort and grouping orders, and output formats. Mistress /QBE decodes the information entered on the screen and formulates a Mistress Query Language command which is passed to the Mistress standard C language interface for execution. With a few minor exceptions, any query which can be written in the Mistress Query language can also be written in Mistress/QBE. The interface also includes a high-level operator- called grouping, which is supported by IBM's QBE but not by native Mistress.

Library of Congress Subject Headings

Database management; Electronic data processing--Distributed processing; Programming languages (Electronic computers); Query languages (Computer science)

Publication Date


Document Type


Department, Program, or Center

Computer Science (GCCIS)


Etlinger, Henry

Advisor/Committee Member

Comte, Chris


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: QA76.9.D3 V636 1988


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