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picture1_History Ppt 75413 | Lecture 18 Relational Algebra


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File: History Ppt 75413 | Lecture 18 Relational Algebra
lecture 18 today s lecture 1 the relational model relational algebra 2 relational algebra pt ii 2 lecture 18 section 1 1 the relational model relational algebra 3 lecture 18 ...

icon picture PPTX Filetype Power Point PPTX | Posted on 02 Sep 2022 | 3 years ago
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 Lecture 18
       Today’s Lecture
       1. The Relational Model & Relational Algebra
       2. Relational Algebra Pt. II
                                                                          2
Lecture 18  >  Section 1
       1. The Relational Model & 
       Relational Algebra
                                                                          3
Lecture 18  >  Section 1
       What you will learn about in this 
       section
       1. The Relational Model
       2. Relational Algebra: Basic Operators
       3. Execution
       4. ACTIVITY: From SQL to RA & Back
                                                                          4
Lecture 18  >  Section 1  >  The Relational Model
      Motivation
           The Relational model is precise, 
           The Relational model is precise, 
              implementable, and we can 
              implementable, and we can 
           operate on it (query/update, etc.)
           operate on it (query/update, etc.)
          Database maps internally into this 
          Database maps internally into this 
                    procedural language.
                    procedural language.
Lecture 18  >  Section 1  >  The Relational Model
       A Little History
                                                                    Won 
       • Relational model due to Edgar “Ted” Codd,                  Won 
                                                                    Turing 
         a mathematician at IBM in 1970                             Turing 
                                                                    award 
          • A Relational Model of Data for Large Shared D           award 
                                                                    1981
            ata Banks                                               1981
            ". Communications of the ACM 13 (6): 377–387
       • IBM didn’t want to use relational model 
         (take money from their Information 
         Management System)
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...Lecture today s the relational model algebra pt ii section what you will learn about in this basic operators execution activity from sql to ra back motivation is precise implementable and we can operate on it query update etc database maps internally into procedural language a little history won due edgar ted codd turing mathematician at ibm award of data for large shared d ata banks communications acm didn t want use take money their information management system...

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