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Salvo 'LtWorf' Tomaselli c2a772e797 Compile selection expression 
When running a selection, compiling the expression into a code object
so that it does not need to be re-parsed per every iteration.

Since it saves one parse per iteration, the gains become more
noticeable as the size of the relations grow.
2015-11-20 15:48:20 +01:00
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relational Compile selection expression 2015-11-20 15:48:20 +01:00
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README.md

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.