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The symbols previously used were a Canadian script, and were looking good enough, but they might not be installed in every machine. Besides, all this is to workaround a Qt5 bug that prevents from rendering those symbols at times. |
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| debian | ||
| feedback-ltworf | ||
| relational | ||
| relational_curses | ||
| relational_gui | ||
| relational_readline | ||
| samples | ||
| setup | ||
| test | ||
| windows | ||
| .gitignore | ||
| CHANGELOG | ||
| COPYING | ||
| CREDITS | ||
| Makefile | ||
| README.md | ||
| TODO | ||
| complexity | ||
| driver.py | ||
| relational-cli.1 | ||
| relational.1 | ||
| relational.desktop | ||
| relational_gui.py | ||
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.
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.