'Attribute names' diaporamas de présentation

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Putting XML to Work

Putting XML to Work

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1.52k views • 133 slides
XML and Databases

XML and Databases

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1.16k views • 101 slides
The Relational Model

The Relational Model

The Relational Model. Relations. S.S.N. street. A relation is a more concrete construction, of something we have seen before, the ER diagram. A relation is (just!) a table! We will use table and relation interchangeably, except where there is a possibility of confusion. name. city.

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868 views • 77 slides
Schema Refinement (end) Relational Algebra

Schema Refinement (end) Relational Algebra

Schema Refinement (end) Relational Algebra. Lecture #8. Normal Forms. First Normal Form = all attributes are atomic Second Normal Form (2NF) = old and obsolete Boyce Codd Normal Form (BCNF) Third Normal Form (3NF) Fourth Normal Form (4NF) Others. Multi-valued Dependencies.

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919 views • 75 slides
Relational Database Structure

Relational Database Structure

Relational Database Structure. - Relation : set of tuples - Tuple : 1) ordered set (i.e. list) of values from domain D1, D2, ..., Dk 2) mapping from attribute names to values in the domains of the attributes => standard definition

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3.01k views • 67 slides
Chapter 3

Chapter 3

Chapter 3. The Relational Data Model. Data and Its Structure. Data is actually stored as bits, but it is difficult to work with data at this level. It is convenient to view data at different levels of abstraction .

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631 views • 63 slides
Chapter

Chapter

Chapter. SQL DML. Retrieval Queries in SQL. SQL has one basic statement for retrieving information from a database; the SELECT statement This is not the same as the SELECT operation of the relational algebra

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753 views • 59 slides
Enterprise & Application Frameworks

Enterprise & Application Frameworks

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555 views • 48 slides
Learning to Map Between Schemas Ontologies

Learning to Map Between Schemas Ontologies

Learning to Map Between Schemas Ontologies. Alon Halevy University of Washington Joint work with Anhai Doan and Pedro Domingos. Agenda. Ontology mapping is a key problem in many applications: Data integration Semantic web Knowledge management E-commerce LSD:

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555 views • 47 slides
Relational Algebra (end) SQL

Relational Algebra (end) SQL

Relational Algebra (end) SQL. April 19 th , 2002. Complex Queries. Product ( pid , name, price, category, maker-cid) Purchase (buyer-ssn, seller-ssn, store, pid) Company ( cid , name, stock price, country) Person( ssn , name, phone number, city). Note:

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448 views • 38 slides
Query Processing and Optimization

Query Processing and Optimization

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1.27k views • 32 slides
CITA 330 Section 4

CITA 330 Section 4

CITA 330 Section 4. XML Schema. XML Schema (XSD). An alternative industry standard for defining XML dialects More expressive than DTD Using XML syntax Promoting declaration reuse so common declarations can be factored out and referenced by multiple element or attribute declarations.

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318 views • 20 slides
Data Warehousing/Mining Comp 150 Aggregation in SQL (not in book)

Data Warehousing/Mining Comp 150 Aggregation in SQL (not in book)

Data Warehousing/Mining Comp 150 Aggregation in SQL (not in book). Instructor: Dan Hebert. Aggregate Functions in SQL. Aggregation is an operation that computes a single value from all the values of an attribute.

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302 views • 19 slides
Insert & Delete

Insert & Delete

Insert & Delete. Objectives of the Lecture :. To consider the insertion of tuples into a relation; To consider the deletion of tuples from a relation; To consider how to do insertions and deletions in SQL. For conceptual simplicity, these all involve sets of tuples. Updating a Relation.

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286 views • 15 slides
Chapter 8 Part 2

Chapter 8 Part 2

Chapter 8 Part 2. SQL-99 Schema Definition, Constraints, Queries, and Views. Chapter Outline. SQL Data Definition and Data Type The CREATE TABLE command in SQL Attribute data types and domains in SQL Specifying Constraints in SQL Specifying attribute constraints and attribute defaults

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234 views • 14 slides
The Unreasonable Effectiveness of Data

The Unreasonable Effectiveness of Data

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572 views • 10 slides
Viewing relational data as XML

Viewing relational data as XML

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168 views • 8 slides

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206 views • 7 slides
Elements and Attributes

Elements and Attributes

Elements and Attributes. XHTML Elements. The <head> element contains special information that does not necessarily show up on the web page. <head> </head> <title> </title> <body> </body>. The <title> element determines what text will display in the title bar of the web browser.

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180 views • 7 slides
Section 6.1

Section 6.1

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