Beyond Relations as Sets: Multisets, Complex Objects, Sequences, and Streams
Beyond Relations as Sets: Multisets, Complex Objects, Sequences, and Streams. Equivalences Among Relational Expressions; Aho, Sagiv, and Ullman, SIAM J. Computing, 1979 Four Views of Complex Objects: A Sophisticate's Introduction; Hull, LNCS 361 Nested Relations and Complex Objects, 1987
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