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Lu Chaojun, SJTU 1 Extended Relational Algebra. Bag Semantics A relation (in SQL, at least) is really a bag (or multiset). –It may contain the same tuple. - ppt download
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Relational Operations on Bags Extended Operators of Relational Algebra. - ppt download
SQL, RA, Sets, Bags Fundamental difference between theoretical RA and practical application of it in DBMSs and SQL RA uses sets SQL uses bags (multisets) - ppt download
Bag union operation in relational algebra - Database Administrators Stack Exchange
Automated Reasoning about the Entity Integrity of Big Data in Possibilistic SQL | Semantic Scholar
PPT - Extended Operators in SQL and Relational Algebra PowerPoint Presentation - ID:1755475
PPT - Extended Operators in SQL and Relational Algebra PowerPoint Presentation - ID:1755475
My CTS Bag: SQL Questions:Bank Management system-2
Combinations of Data Dimensions, a Formalization of their Supporting... | Download Scientific Diagram