*** πreal |test| |issues|***

Pireal is an educational tool for working with relational database using the query language of relational algebra. Currently under development.

• GNU/Linux
• Windows
• Mac OS X

Running from sources

• Python 3.x
• PyQt4

Clone the repository: :

git clone https://github.com/centaurialpha/pireal.git

or download the .zip file and running: :

cd pireal
python pireal.py

• Semicolon at the end of each line is not necessary
• SQL style comments

-- This is a comment on Pireal
-- Other comment

• Valid queries

q1 = people njoin skills
q2 = select age > 25 (q1)
q3 = project id, name, skill (q2)

or

project id, name, skill (select age > 25 (people njoin skills))

The operations are defined in this file.

• Selection
• Projection
• Rename
• Product
• Union
• Difference
• Natural Join
• Intersection
• Division

Gabriel Acosta

• e-mail: acostadariogabriel at gmail
• web: centaurialpha.githib.io
• twitter: @_alfacentauri