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PPT - SQL, RA, Sets, Bags PowerPoint Presentation, free download - ID:2808287
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
PPT - Extended Operators in SQL and Relational Algebra PowerPoint Presentation - ID:1755475
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PPT - Extended Operators in SQL and Relational Algebra PowerPoint Presentation - ID:1755475
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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
