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Relational Algebra-Relational Calculus-SQL

1 Database Systems Session 5 Main Theme Relational algebra , Relational calculus , and SQL Dr. Jean-Claude Franchitti New York University Computer Science Department Courant Institute of Mathematical Sciences Presentation material partially based on textbook slides Fundamentals of Database Systems (6th Edition) by Ramez Elmasri and Shamkant Navathe Slides copyright 2011 and on slides produced by Zvi Kedem copyight 2014 2 Agenda 1 Session Overview 5 Summary and Conclusion 2 Relational algebra and Relational calculus 3 Relational algebra Using SQL Syntax 3 Session Agenda Session Overview Relational algebra and Relational calculus Relational algebra Using SQL Syntax Summary & Conclusion 4 What is the class about? Course description and syllabus: Textbooks: Fundamentals of Database Systems (6th Edition) Ramez Elmasri and Shamkant Navathe Addition Wesley ISBN-10: 0-1360-8620-9, ISBN-13: 978-0136086208 6th Edition (04/10) 5 Icons / Metaphors 5 Common Realization Information Knowledge/Competency Pattern Governance Alignment Solution Approach 6 Agenda 1 Session Overview 5 Summary and Conclusion 2 Relational algebra and Relational calculus 3 Relational algebra Using SQL Syntax 7 Agenda Unary Relational Operations: SELECT and PROJECT Relational algebra Operations from Set Theory Binary Relational Operations: JOIN and DIVISION Additional Relational Operations Examples of queries in Relational algebra The Tuple Relational calculus Th

•Boolean expression contains clauses of the form ... Inner joins Type of match and combine operation Defined formally as a combination of ... Some queries cannot be stated with basic relational algebra operations •But are important for practical use

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