Table operations - PowerPoint PPT Presentation

The Relational Model

The Relational Model. Textbook Chapter 2. History. Earlier models: Hierarchical, Network complex to implement and program; efficient; widely used Relational: Introduced by Codd &amp; Date (IBM), 1970 Semantically poor; tractable to analyze; initially inefficient

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Query Optimization Highlights

Query Optimization Highlights. Chapter 16 (intro), 16.1 (skim), 16.2 (skim). Naïve Query Processing. SELECT LNAME FROM EMPLOYEE, DEPARTMENT WHERE DNO=DNUMBER AND SALARY&gt;45000 AND DNAME=&quot;Software Support&quot;; Naively, this is 1 Cartesian product, followed by 3 selects, followed by one project.

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192 views • 4 slides

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