A functional processor for the relational algebra on a microcomputer

摘要

AbstractWe have built on the U.C.S.D. P‐system (running on an IBM Personal Computer) a relational algebra processor, MRDS/FS, which is extremely powerful and which supports a functional syntax for the programmer‐user. The relational algebra is provided in the extended operators μ‐join, σ‐join, project and select. The domain algebra is fully implemented for the first time, giving operations on attributes: arithmetic, logic, comparison and four different categories of aggregation of these. A strictly functional syntax is provided, permitting user‐defined functions using the relational and domain algebras as primitive operations. An interactive editor permits the creation, copying and changing of both relations and user‐defi