DataBase

Web Based Relational Algebra interpreter

Books

Other resources


DataBase Management Systems

The most important free and open source (BSD based license) DBMS is PostgreSQL which is very compatible with SQL standards.

SQLite

SQLite tools

Java based DBMS

Relational Algebra

Web Based Relational Algebra interpreter

Ohter resources

http://www.dcs.warwick.ac.uk/~hugh/TTM/index.html

http://www.dcs.warwick.ac.uk/~hugh/TTM/td3grm.txt

http://c2.com/cgi/wiki?RelationalLanguage

http://www.dcs.warwick.ac.uk/~hugh/TTM/Projects.html

http://dbappbuilder.sourceforge.net/Rel.php

http://www.quicksort.co.uk

http://tclral.sourceforge.net

http://duro.sourceforge.net

Hugh Darwen

http://www.thimbleware.com/projects/jrel

Web-based SQL commands emulator

Web-based Graphical SQL Designer