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Extended Operators in SQL and Relational Algebra

Extended Operators in SQL and Relational Algebra. Zaki Malik September 11, 2008. Bags . A bag ( or multi-set ) is like a set, but an element may appear more than once. Example: {1,2,1,3} is a bag. Example: {1,2,3} is also a bag that happens to be a set. Why Bags?.

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Outerjoin r - PowerPoint PPT Presentation

Extended Operators in SQL and Relational Algebra