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Salvo 'LtWorf' Tomaselli a8c1b2a463 Revert copy on write optimization 
In case of multiple renames, all of the resulting relations will point
to the same data, so writing on one and marking its only known copy
as writable would be incorrect.

For this to work, all the references should be kown to all the other
instances.

It is probably not worth to implement it.

Implemented test for the update
 		2015-11-18 12:15:03 +07:00
debian Merged debian changes from revision -2 2015-10-23 17:10:41 +07:00
feedback-ltworf Prepare for next release 2015-09-15 01:58:17 +07:00
relational Revert copy on write optimization 2015-11-18 12:15:03 +07:00
relational_gui Removed unused variable 2015-11-11 17:01:52 +07:00
relational_readline Silent mode if using scripts 2015-11-06 16:03:58 +07:00
samples - Change from 0.12 to version 1.0 2011-03-04 12:38:00 +07:00
setup Prepare for next release 2015-09-15 01:58:17 +07:00
test Revert copy on write optimization 2015-11-18 12:15:03 +07:00
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CHANGELOG Ctrl+C in the terminal, will kill the GUI 2015-10-09 11:33:19 +07:00
COPYING renamed equijoin to thetajoin 2008-07-17 22:53:32 +07:00
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README.md Better readme 2015-09-11 14:20:08 +07:00
TODO - Using more the colored class 2011-05-02 10:02:06 +07:00
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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

If it needs some dependencies:

  • Qt5
  • Python 3.4 or greater
  • PyQt5
  • pyuic5 and pyrcc5

You will need to run

make

to generate some .py files.

To launch the application, run

./relational_gui.py

Running on osx

You can probably follow the instructions on running from sources to rut on osx.

If you encounter problems, don't ask me for help.

If you encounter problems and overcome them, please tell me how to update this README.