Search Results for "relational algebra"

doobie is a pure functional JDBC layer for Scala and Cats. It is not an ORM, nor is it a relational algebra; it simply provides a functional way to construct programs (and higher-level libraries) that use JDBC. For common use cases doobie provides a minimal but expressive high-level API. doobie is a Typelevel project. This means we embrace pure, typeful, functional programming, and provide a safe and friendly environment for teaching, learning, and contributing as described in the Scala Code of Conduct. ...

The Datalog Educational System (DES) is a deductive database with Datalog, SQL, Relational Algebra, Tuple Relational Calculus and Domain Relational Calculus as query languages developed mainly for education. It can be used from most common Prolog interpreters over any supported OS and from portable executables (Windows, Linux and MacOS).

The project has 2 related sets of aims. As a language, RAQUEL is to : 1. be a pure relational algebra language (unlike SQL) as defined by Date & Darwen's "The Third Manifesto"; 2. incorporate a generalised extension of the ANSI-SPARC 3-layer DB architecture; 3. have the maximum ratio of functionality to conceptual complexity (as defined by Fred Brooks). As a DBMS, RAQUEL is to : 1. have an Open Architecture, enabling a variety of DBMS configurations of 'black box' code, each installation optimised for a certain kind of DB; 2. be a stack of core black boxes to provide general DBMS functionality, plus a range of plug-in black boxes to support different physical storage mechanisms & scalar data types; 3. employ code designed with a mixture of functional, OO & other methods so as to minimise internal DBMS state complexity. ...

A relational database management system, based on the principles laid down in the book "Databases, Types, and The Relational Model: The Third Manifesto" by C. J. Date and Hugh Darwen.

TclRAL is an implementation of the Relational Algebra as an extension of the Tcl Language. TclRAL is coded in "C" and provides new data types that are integrated into Tcl's internal object system. Raloo is a Tcl package that combines TclRAL and TclOO. Please note that the source code for this project has been moved to a Fossil repository that can be accessed from the menu bar.

A robust Java implementation of relational algebra (RA) interpreter for MySQL databases. The interpreter receives relational algebra queries, converts them to equivalent MySQL queries, executes them, and prints the answers. Compiler tools JFlex and JCup are used to parse RA queries. Rigorous semantic checks are enforced so that invalid queries are not executed. The system is built as a Java terminal application.

Relational Algebra is a very important formal language associated with relational databases. This is why most of the universities have Relational Algebra as an integral part of their database management courses. But unfortunately, most of the traditional relational DBMS software tools support Structured Query Language (SQL) only. For a student it is very difficult to know whether a relational algebra query written on paper is correct or not. ...

A java library that translates SQL into relational algebra. Includes a demonstration program using the library. Supports a subset of SQL-92. Version 7.1.8 as of January 2015

Kure is a C library which provides manipulation of relations and operations of relation algebra using a fast implementation using binary decision diagram. It provides a Lua based domain-specific embedded programming language to conveniently manipulate and work with relations. For instance, given relations R, S, the tupling of them can be computed using [R,S] and they can be composed using R*S.

This tool executes simple relational algebra expressions. It is useful for learning of Database course. Javascript and xhtml is used to develop this tool , so it can be run on any platform which have a web browser. Mirror http://launchpad.net/webrel/

BeanDB intends to implement relational algebra with JavaBeans as domains and various storage engines as backends; including direct storage into a file system and RDBMS. This provides an alternative to object-relational mappings for Java developers.

UDA stands for Universal Descriptive Algebra. It consists of a Java package handling universal algebras and relational structures as description systems.

...Calculation sequences are stored in the database. These sequences are made from simple operations on data, eg, add two table columns, or sort a table. This is similar to relational algebra.

Parser that converts Relational Algebra into SQL and executes SQL on postgres db

Relationale is a domain-specific language implementing relational algebra atop a general-purpose host language. It features a static type system, type inference, lexical scope, and delayed evaluation. A proof-of-concept is being developed in Python.

Cilantro is an implementation (in Java) of "Object Algebra", a solution to the Impedance Problem. It connects object-oriented programs to relational databases. In Cilantro, queries are first-class objects and can be combined to create other queries.

LEAP is an RDBMS (Relational Database Management System) implementing the relational Algebra - a core part of relational database theory. It is primarily used as an educational tool, but has found some novel uses and applications.

...Different from the text-based programming language, SPL writes code in gridlines: find more in A programming language coding in a grid; as a data computing engine, SPL can generate high efficiency at much lower cost: esProc SPL, a data analysis engine reducing application cost by N times. When working as a data warehouse, esProc SPL does not adopt the relational algebra-based SQL syntax. It invents an algebraic system called discrete data set instead: SPL: a database language featuring easy writing and fast running to solve the problems of hard-to-code complex SQL. You are welcome to post your troubles and problems when trying to achieve high performance computing and discuss with us to find a solution.