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  1. Proceedings of the 2006 ACM SIGPLAN workshop on Haskell (Haskell '06)
  2. Strong types for relational databases
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RepLib: a library for derivable type classes
Polymorphic variants in Haskell
User-level transactional programming in Haskell
GenI: natural language generation in Haskell
A generic recursion toolbox for Haskell or: scrap your boilerplate systematically
Extended static checking for haskell
An extensible dynamically-typed hierarchy of exceptions
Statically typed linear algebra in Haskell
Strong types for relational databases
Running the manual: an approach to high-assurance microkernel development
Interactive debugging with GHCi
Haskell' status report
Strongly typed memory areas programming systems-level data structures in a functional language
Introducing the Haskell equational reasoning assistant

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Strong types for relational databases

Content Provider ACM Digital Library
Author Visser, Joost Silva, Alexandra
Abstract Haskell's type system with multi-parameter constructor classes and functional dependencies allows static (compile-time) computations to be expressed by logic programming on the level of types. This emergent capability has been exploited for instance to model arbitrary-length tuples (heterogeneous lists), extensible records, functions with variable length argument lists, and (homogenous) lists of statically fixed length (vectors).We explain how type-level programming can be exploited to define a strongly-typed model of relational databases and operations on them. In particular, we present a strongly typed embedding of a significant subset of SQL in Haskell. In this model, meta-data is represented by type-level entities that guard the semantic correctness of database operations at compile time.Apart from the standard relational database operations, such as selection and join, we model functional dependencies (among table attributes), normal forms, and operations for database transformation. We show how functional dependency information can be represented at the type level, and can be transported through operations. This means that type inference statically computes functional dependencies on the result from those on the arguments.Our model shows that Haskell can be used to design and prototype typed languages for designing, programming, and transforming relational databases.
Starting Page 25
Ending Page 36
Page Count 12
File Format PDF
ISBN 1595934898
DOI 10.1145/1159842.1159846
Language English
Publisher Association for Computing Machinery (ACM)
Publisher Date 2006-09-17
Publisher Place New York
Access Restriction Subscribed
Subject Keyword Functional dependency theory Relational databases Haskell Type-level programming Sql
Content Type Text
Resource Type Article
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