Accession Number : ADA236478


Title :   An Exploratory Study of the Interpretation of Logical Operators in Database Querying (Een Verkennende Studie van de Interpretatie van Logische Operatoren bijhet Bevragen van een Database)


Descriptive Note : Final rept.


Corporate Author : INSTITUTE FOR PERCEPTION RVO-TNO SOESTERBERG (NETHERLANDS)


Personal Author(s) : Essens, P. J. ; McCann, C. A. ; Hartevelt, M. A.


Full Text : http://www.dtic.mil/get-tr-doc/pdf?AD=ADA236478


Report Date : 22 MAR 1991


Pagination or Media Count : 29


Abstract : The use of logical operators in query languages is considered to be a major source of user problems in database querying. The present study investigated whether people untrained in logic could successfully interpret logical operators; and, how errors and latencies are related to the structure of the query. In an experiment, the logical complexity of an SQL-style query formulation was varied in using AND, OR, and NOT operators in either single or combined form. The latency and error data converged to show that subjects had increasing difficulty with queries constructed with a combination of different operators. The inclusion of brackets had a strong positive effect on task performance. Verbal protocols were used to identify sources of errors in query processing. A model of query processing was formulated and predictions latencies and errors on the basis of processing components were tested.


Descriptors :   *DATA BASES , JOBS , TRANSLATIONS , ERRORS , USER NEEDS , SOURCES , PROCESSING EQUIPMENT


Subject Categories : COMPUTER PROGRAMMING AND SOFTWARE


Distribution Statement : APPROVED FOR PUBLIC RELEASE