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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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810 views • 56 slides

Transactions

Transactions. Serializability Isolation Levels Atomicity. The Setting. Database systems are normally being accessed by many users or processes at the same time. Both queries and modifications.

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419 views • 23 slides

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Bad interaction - PowerPoint PPT Presentation

Extended Operators in SQL and Relational Algebra

Transactions