Please use this identifier to cite or link to this item:
Title: Visual query languages for entity relationship model databases
Authors: Chan, H.C. 
Issue Date: Apr-1997
Citation: Chan, H.C. (1997-04). Visual query languages for entity relationship model databases. Journal of Network and Computer Applications 20 (2) : 203-221. ScholarBank@NUS Repository.
Abstract: More and more relational database systems for microcomputers are providing visual interfaces, such as query by example (QBE). At the same time, experimental studies are providing more support for the theory that the end users can perform better with the entity relationship (ER) model than with the relational model, for both database design and retrieval tasks. In fact, there are already microcomputer systems for designing the database model based on entities and relationships. The logical development is for future systems to incorporate a visual retrieval module based on the entity relationship model. To provide guidelines for the design of these new interfaces, many proposed visual query languages (VQLs) are analysed and compared from the user's viewpoint. The analysed features include ER concepts, interaction modes, model diagram transformations, condition specification, aggregate functions, and output organisation. Different competing approaches adopted by the VQLs are highlighted. Empirical evidence on user's performance with VQLs are also examined. The survey results enable designers of future VQLs to build on existing techniques. It also identifies major approaches for human-factor researchers to empirically determine the best for users. © 1997 Academic Press Limited.
Source Title: Journal of Network and Computer Applications
ISSN: 10848045
Appears in Collections:Staff Publications

Show full item record
Files in This Item:
There are no files associated with this item.

Page view(s)

checked on Feb 28, 2021

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.