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Projects archive / Relational Algebra Tutor

Code:ratRoe2003
Title:Relational Algebra Tutor
Author:Chris Roe
Date:4-Sep-2003
Type:model
Funding:PhD - PhD thesis
Short description:Visual support for relational algebra queries
EM Technologies:tkeden, %eden, %scout, %donald
Keywords:tool, HCI, tutorial
empublic references:sqleddiWard2003
EMpress references:
Web site references:
Previous locations:
Tour:README

Relational Algebra queries can be hard to understand in their symbolic form. To understand how an EDDI query such as ?(allfruits * apple) %name, begin, price; works you need to know the meaning of each of the symbols and how that applies to the tables you are working with. This environment provides support for visualising EDDI queries and uses colour coding to show how output tables are created from the source tables of the query.

ratRoe2003 is available locally within DCS at /dcs/emp/empublic/projects/ratRoe2003
Download ratRoe2003.tar.gz
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README 1864 11:58 AM Sep 04 2003 12:19 PM Jul 27 2017
README.xml 1026 09:46 AM Sep 04 2003 12:19 PM Jul 27 2017
Run.e 205 03:32 PM Jul 29 2003 12:19 PM Jul 27 2017
crewin.e 12552 04:03 PM Nov 21 2002 12:19 PM Jul 27 2017
display.txt 1527 08:21 PM Jul 28 2003 12:19 PM Jul 27 2017
eddiquery.e 1385 09:48 PM Jul 30 2003 12:19 PM Jul 27 2017
fruits.eddi 709 12:00 AM Nov 02 2001 12:19 PM Jul 27 2017
grid.e 10400 01:17 PM Aug 03 2003 12:19 PM Jul 27 2017
oldgrid.txt 9138 04:17 PM Jul 29 2003 12:19 PM Jul 27 2017
outputwindows.txt 22810 09:47 PM Sep 03 2003 12:19 PM Jul 27 2017
query.s 12270 12:35 PM Aug 03 2003 12:19 PM Jul 27 2017
query_gui.txt 534 11:11 AM Nov 22 2002 12:19 PM Jul 27 2017
screenshot.jpg 60036 09:46 AM Sep 04 2003 12:19 PM Jul 27 2017

empublic system initially created by Ashley Ward with assistance from Chris Roe and Meurig Beynon.