RQL User Manual
D. J. Burrage, Gilman, Michael · eScholarship@McGill (McGill) · 1982
RQL - Relational Query Language - is a relational data base management system based on the operations of relational algebra as first proposed by Codd. RQL's query language is an expanded version of the query language presented in the book by C. J.Date, Introduction to Database Systems, 2nd Edition, Chapter 6. [..]