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Salvo 'LtWorf' Tomaselli 0aa372792f Session management 
Adds some functions to store and load an entire session as a binary
blob.

In this way the user does not need to re-load all the relations from the
previous session.
 		2015-08-03 15:56:37 +07:00
debian Removed debian patch for encoding in tests 2015-06-16 10:32:40 +07:00
feedback-ltworf Prepare for version 2.1 2015-06-13 17:34:13 +07:00
relational Session management 2015-08-03 15:56:37 +07:00
relational_gui Classes have now names that begin with uppercase 2015-07-14 15:39:35 +07:00
relational_readline Removed encoding string 2015-07-14 10:43:13 +07:00
samples - Change from 0.12 to version 1.0 2011-03-04 12:38:00 +07:00
setup Removed encoding string 2015-07-14 10:43:13 +07:00
test Added new tests on joins 2015-06-06 14:06:02 +07:00
windows Removed encoding string 2015-07-14 10:43:13 +07:00
.gitignore gitignore 2013-02-10 14:25:30 +07:00
CHANGELOG Changelog 2015-07-14 15:43:41 +07:00
COPYING renamed equijoin to thetajoin 2008-07-17 22:53:32 +07:00
CREDITS - termcolor modified to use bold by default 2011-04-01 10:28:47 +07:00
Makefile Switch GUI generation to Qt5 2015-02-19 13:59:41 +07:00
README.md Updated README's examples 2015-05-31 19:12:10 +07:00
TODO - Using more the colored class 2011-05-02 10:02:06 +07:00
complexity Get rid of the last remains of galileo 2013-12-27 00:47:48 +07:00
driver.py Style 2015-07-14 11:01:35 +07:00
relational-cli.1 Updated manpages 2015-06-01 12:54:52 +07:00
relational.1 Updated manpages 2015-06-01 12:54:52 +07:00
relational.desktop Make lintian happy 2013-12-27 01:02:04 +07:00
relational_gui.py Style 2015-07-14 11:01:35 +07:00

README.md
Unescape Escape

Relational an educational tool to provide a workspace for experimenting with relational algebra, an offshoot of first-order logic.

It provides GUI that can be used for executing relational queries, and also provides a command line interface.

Provides a standalone Python module that can be used for executing relational queries, parsing relational expressions and optimizing them.

Official website

More documentation can be found here http://ltworf.github.io/relational/

Install

Binary download for Windows can be obtained from the website.

For Linux, check your distribution's packages, relational is available on Debian and Ubuntu.

Syntax

These are some valid queries

σage > 25 and rank == weight(A)
σ (name.upper().startswith('J') and age>21 )(people)
Q ⋈ π a,b(A) ⋈ B
ρid➡i,name➡n(A) - π a,b(π a,b(A)) ∩ σage > 25 or rank = weight(A)
π a,b(π a,b(A))
ρid➡i,name➡n(π a,b(A))
A ⋈ B

Run from sources

To launch the application, run

./relational_gui.py

If it needs some dependencies: Qt5, Python 3.4 or greater, PyQt5

It can run on osx but bugreports about that will be rejected.