Definition
Functional Query Languages came from two lines of development:
- 1.
From new functional programming languages such as FP that showed the value of referential transparency; this ensures that complex nested functional expressions can be evaluated inside-out (bottom-up) or top-down or even split up and done in parallel, with the same result. For optimization purposes this is vastly better than state-altering algorithms used in early CODASYL systems, or even code used today with embedded SQL (as in ODBC).
- 2.
From requirements to provide a single query language and a single integrated schema over multiple autonomous, heterogeneous, distributed databases. This happened in the MULTIBASE project and resulted in the DAPLEX language [1]. It was the first functional query language to compute over instances of a Functional Data Model, for the purpose of abstracting away details of different storage schemas in a distributed DB.
Historical Background
No full implementation of DAPLEX was...
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Gray, P.M.D. (2018). Functional Query Language. In: Liu, L., Özsu, M.T. (eds) Encyclopedia of Database Systems. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-8265-9_1092
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DOI: https://doi.org/10.1007/978-1-4614-8265-9_1092
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