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### 11.SQL1-2-sp-08

Course: CS 186, Fall 2009
School: Berkeley
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Word Count: 1233

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SQL: Review The Query Language Part 1 R &amp;G - Chapter 5 Relational Algebra (Operational Semantics) Given a query, how to mix and match the relational algebra operators to answer it Used for query optimization Relational Calculus (Declarative Semantics) Given a query, what do I want my answer set to include? Algebra and safe calculus are simple and powerful models for query languages for relational...

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SQL: Review The Query Language Part 1 R &G - Chapter 5 Relational Algebra (Operational Semantics) Given a query, how to mix and match the relational algebra operators to answer it Used for query optimization Relational Calculus (Declarative Semantics) Given a query, what do I want my answer set to include? Algebra and safe calculus are simple and powerful models for query languages for relational model Have same expressive power SQL can express every query that is expressible in relational algebra/calculus. (and more) The important thing is not to stop questioning. Albert Einstein Query Optimization Rel. Algebra Query 1 Rel. Algebra Query 2 Relational Query Languages Two sublanguages: DDL Data Definition La...
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