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Published byGordon Wilkinson Modified over 9 years ago
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Jennifer Widom SQL Introduction
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Jennifer Widom SQL: Intro “S.Q.L.” or “sequel” Supported by all major commercial database systems Standardized – many new features over time Interactive via GUI or prompt, or embedded in programs Declarative, based on relational algebra
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Jennifer Widom Data Definition Language (DDL) Data Manipulation Language (DML) Other Commands indexes, constraints, views, triggers, transactions, authorization, … SQL: Intro
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Jennifer Widom The Basic SELECT Statement Select A 1,A 2,…,A n From R 1,R 2, …,R m Where condition SQL: Intro
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Jennifer Widom SQL: Intro “S.Q.L.” or “sequel” Supported by all major commercial database systems Standardized – many new features over time Interactive via GUI or prompt, or embedded in programs Declarative, based on relational algebra
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