Member Avatar for magaji ahmed

I want a perl parser for relational algebra expression, can anybody help me with a code for that.

Edited by magaji ahmed because: clearity
  • 4 Contributors
  • 4 Replies
  • 138 Views
  • 6 Days Discussion Span
  • Latest Post Latest Post by magaji ahmed
Member Avatar for 2teez

like how?

Member Avatar for magaji.ahmedgodiya

Iam trying to write a perl program that evaluate relational algebra expression by converting it to sql first.

Member Avatar for doubi

Hi magaji.ahmedgodiya,

What format is your input? Can you paste us some examples?

A quick CPAN search turns up Math::Algebra::Symbols. There's also Math::Symbolic which is apparently a bit more abstract. If neither of those look promising, you could review the API docs for the Perl Data Language (PDL) and see if anything there looks helpful.

Hard to know what else to say without some examples of what you actually want to do. Again, some examples of desired input and output would help.

Good luck,

--doubi

Member Avatar for magaji ahmed

I want parse queries that make use of relational algebra operators such as 'select, project, join, union,intersection, theater join, rename. After that the program should convert the query to SQL and evaluate it on a micro soft access database.
Example:
projectlist of attributes
And so on

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.