Relational Data File is a historical query language created in 1965.

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  • Relational Data File does not currently rank in our top 50% of languages
  • Relational Data File first appeared in 1965
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Example code from the web:

IF (x AUTHORED PAPER y)
AND (y SUBJECT INDEXED UNDER pattern recognition)
THEN (x CONDUCTS RESEARCH ON pattern recognition)

Last updated October 14th, 2019