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This converts the GUI code to use Qt5 and Python3 The GUI is still somewhat buggy, and it can't open files yet, but seems to be mostly working, extensive testing will be needed before this can be released.
1.2 KiB
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.
Install
Windows installer can be found here: https://code.google.com/p/relational/downloads/list
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 ᐅᐊ π a,b(A) ᐅᐊ B
ρid➡i,name➡n(A) - π a,b(π a,b(A)) ᑎ σage > 25 or rank = weight(A)
π a,b(π a,b(A))
ρid➡i,name➡n(π a,b(A))
A ᐅᐊ B
More documentation can be found here http://ltworf.github.io/relational/
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 this is not supported.