'Base relation' diaporamas de présentation

Relations

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Chapter 10: Normalization of Relational DataBase

Chapter 10: Normalization of Relational DataBase. Csci455 Fall 2003. Objectives. Design Methodologies Goodness of design Define functional dependencies among columns of a table The normalization process Usefulness and limitations of normalization. Design Methodology.

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The Relational Model 1

Lecture 5. The Relational Model 1. Prof. Sin-Min Lee Department of Mathematics and Computer Science. Prof. Sin-Min Lee Department of Computer Science. History of Relational Model. First proposed by a E.F. Codd in 1970. Codd proposed the Relational model in 1970.

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???????? 5

???????? 5. SQL Data Definition Language ??? ????? ??????? ????????? ?????? ????????? ( QBE). SQL Data Definition. The Data Definition Language (DDL) of SQL is used to CREATE, DROP and ALTER the descriptions of the relations in the database CREATE TABLE DEPARTMENT

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System R: Relational Approach to Database Management

System R: Relational Approach to Database Management. CIS 661 Data Management Course Instructor: Vasilis Megalooikonomou By: Sarika Notani. Contents:. Introduction Architecture & System Structure Relational Data System Host Language Interface Query Facilities

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Chapter 4

Chapter 4. The Relational Model. Objectives. Terminology of relational model. How tables are used to represent data. Connection between mathematical relations and relations in the relational model. Properties of database relations. How to identify CK, PK, and FKs.

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Pertemuan <<#05>> <<MODEL RELASIONAL>>

Matakuliah : <<M0094>>/<<Pengantar Sistem Basis Data>> Tahun : <<2005>> Versi : <<1/1>>. Pertemuan <<#05>> <<MODEL RELASIONAL>>. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa akan mampu : Mahasiswa dapat Menerangkan konsep dan terminologi pemodelan relasional.

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Minggu 2, Pertemuan 3 The Relational Model

Minggu 2, Pertemuan 3 The Relational Model. Matakuliah : T0206-Sistem Basisdata Tahun : 2005 Versi : 1.0/0.0. Learning Outcomes. Pada akhir pertemuan ini, diharapkan mahasiswa m ahasiswa dapat menjelaskan terminologi dan konsep relational model (C2). Outline Materi.

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Lecture 2

Lecture 2. The Relational Model. Objectives. Terminology of relational model. How tables are used to represent data. Connection between mathematical relations and relations in the relational model. Properties of database relations. How to identify CK, PK, and FKs.

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The Relational Model

The Relational Model. Chapter 3. History of the Relational Model. The objectives of the relational model :

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Chapter 3

Chapter 3. RELATIONAL MODEL. Chapter 3 - Objectives. Terminology of relational model. How tables are used to represent data. Connection between mathematical relations and relations in the relational model. Properties of database relations.

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Integrity

Integrity. Keys. Candidate Keys. K: a set of attributes of relvar R K is a candidate key for R iff Uniqueness No legal values of R contain two distinct tuples with the same value of K Irreducibility(minimality) No proper subset of k has the uniqueness Syntax

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Views

Views. External View of Ansi-Sparc Architecture. In most relational DBMS a view is a virtual relation which acts as a dynamic window on the base relations Materialised views are a research issue and raise consistency issues

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Chapter 3

Chapter 3. The Relational Model. Agenda. Concept Property Key Integrity Constraint Base Relation & View. Concept. Relation Attribute Domain Tuple Degree Cardinality Relational Database. Property. Unique relation name Unique attribute No duplication tuples

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