Converting SQL to relational algebra [closed]

Question

Does anyone know any good online resources which I can use to practise SQL to relational algebra conversion?

Buzzer

SQL is the most common way to express relational algebra on a computer. What kind of language would you convert it to? – Intermezzo

possible duplicate of SQL -> Relational Algebra – Intermezzo

I just want to be able to express an SQL statement as in its relational algebraic form (using selection, projection, intersection, union etc) – Buzzer

@Andomar, not a duplicate of that question. This ask a general question, the other an example SQL statement for a given query. – Flawed

Answer 1

See: http://db.grussell.org/index.html
The following powerpoint presentation may also be of help:
http://www.cs.wayne.edu/~shiyong/csc6710/slides/kiferComp_348761_ppt05.ppt

Flawed

Half answers the question. +1 nonetheless for good sources. The sources don't explain how to convert aggregate SQL operators (like GROUP BY) to RA, which is what I was looking for. – Hackbut

Answer 2

The online tool RelaX will allow you to convert SQL to Relational Algebra. You can also compose and execute relational algebraic expressions on small datasets.

Lander