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Oracle Database SQL Language Reference 18c. (April, 2020). Retrieved from https://docs.oracle.com/en/database/oracle/oracle-database/18/sqlrf/.
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Relational database theory¶
Childs, David L. “Feasibility of a set-theoretic data structure: a general structure based on a reconstituted definition of relation.” Proc. IFIP Cong. (1968).
Codd, Edgar Frank. “A relational model of data for large shared data banks.” Communications of the ACM 26.1 (1983): 64-69.