Extending Relational Algebra and Relational Calculus with Set-Valued Attributes and Aggregate Functions.

Gultekin Özsoyoglu Z. Meral Özsoyoglu Victor Matos Extending Relational Algebra and Relational Calculus with Set-Valued Attributes and Aggregate Functions. 566-592 TODS12/P566.PDF 1987 12 ACM Trans. Database Syst. 4 db/journals/tods/tods12.html#OzsoyogluOM87 http://doi.acm.org/10.1145/32204.32219 db/journals/tods/OzsoyogluOM87.html conf/pods/AbiteboulB84 ... persons/Codd72 ... ... ... ... journals/jacm/Jacobs82 conf/pods/JaeschkeS82 ... journals/jacm/Klug82 conf/sigmod/Klug82 ... ... journals/is/Orman84 conf/pods/OzsoyogluM85 ... ... conf/icde/OzsoyogluO84 ... conf/sigmod/OzsoyogluOM85 conf/pods/OzsoyogluY85 ... ... ... journals/tods/StonebrakerWKH76 ...