'Relation instance' presentation slideshows

1.52k views • 134 slides

LECTURE 3: Relational Algebra

LECTURE 3: Relational Algebra. THESE SLIDES ARE BASED ON YOUR TEXT BOOK. Query Languages. For manipulation and retrieval of stored data Relational model supports simple yet powerful query languages Query languages are not as complex as programming languages

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Advanced Data Modeling

Advanced Data Modeling. Steffen Staab with Simon Schenk. TexPoint fonts used in EMF. Read the TexPoint manual before you delete this box.: A A A A A. Recursion. connected(StartPoint, EndPoint) :- arc(StartPoint, EndPoint). connected(StartPoint, EndPoint) :-

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Relational Algebra

p. Relational Algebra. R & G, Chapter 4. By relieving the brain of all unnecessary work, a good notation sets it free to concentrate on more advanced problems, and, in effect, increases the mental power of the race . -- Alfred North Whitehead (1861 - 1947). Administrivia.

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Lecture 4: Relational algebra

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Lecture 4: Relational algebra

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Relational Algebra & Calculus

Relational Algebra & Calculus. Chapter 4, Part A (Relational Algebra). Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: Strong formal foundation based on logic.

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Relational Algebra & Calculus

Relational Algebra & Calculus. Chapter 4, Part A (Relational Algebra). Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: Strong formal foundation based on logic.

678 views • 33 slides

Relational Data Model

Relational Data Model. Overview. Relational data model; Tuples and relations; Schemas and instances; Named vs. unnamed perspective; Relational algebra;. Table. Observations. The rows of the table contain pairs occurring in the relation player .

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The Relational Model

The Relational Model. Much of the material presented in these slides was developed by Dr. Ramon Lawrence at the University of Iowa. Important Points. Relational Model Definitions Relational Keys Relational Integrity. Tables. Relational database is a collection of tables

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Database Management Systems Chapter 3 The Relational Data Model (I)

Database Management Systems Chapter 3 The Relational Data Model (I). Instructor: Li Ma Department of Computer Science Texas Southern University, Houston. September, 2006. The Relational Data Model. Tables Schemas Conversion from E/R to Relations. Attributes (column headers). Tuples

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Relational Algebra

Relational Algebra. Chapter 4, Part A. Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: Strong formal foundation based on logic. Allows for much optimization.

465 views • 21 slides

Relational Algebra

Relational Algebra. Relational Query Languages. Query languages : Allow manipulation and retrieval of data from a database. Relational model supports simple, powerful QLs: Strong formal foundation based on logic. Allows for much optimization. Query Languages != programming languages!

530 views • 21 slides

The Relational Models and Their Underlying Concepts

The Relational Models and Their Underlying Concepts. Relational Database is a collection of normalized relations with distinct relation names. A relation is a table with columns and rows. Only applies to logical structure of the database, not the physical structure. Relational Databases.

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Relational Algebra

Relational Algebra. Relational Model: Topic 3. Preliminaries. A query is applied to relation instances , and the result of a query is also a relation instance. Schemas of input relations for a query are fixed (but query will run regardless of instance!)

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Relational Model

Relational Model. Relational Database: Definitions. Relational database : a set of relations Relation: made up of 2 parts: Instance : a table , with rows and columns. #Rows = cardinality , #fields = degree (arity).

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CMSC424: Database Design

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Chapter 3: Relational Model

Chapter 3: Relational Model. Structure of Relational Databases Relational Algebra Tuple Relational Calculus Domain Relational Calculus Extended Relational-Algebra-Operations Modification of the Database Views. Example of a Relation. Basic Structure.

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Relational Model E.F. Codd at IBM 1970 Chapter 7.1-7.2

Relational Model E.F. Codd at IBM 1970 Chapter 7.1-7.2. Relational Model. Most popular simplest most uniform data structures most formal files + mathematical foundation. Relational Model. database is a collection of relations relation is a table of values 

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