'Avg price' diaporamas de présentation

Preparazione di Dati per Data Mining

Preparazione di Dati per Data Mining. Giuseppe Manco. Outline del Modulo. Introduzione e Concetti di Base Motivazioni Il punto di partenza: dati consolidati, Data Marts Information Gathering Misurazioni Visualizzazioni Statistiche Data Selection Manipolazione di Tabelle Data cleaning

1.96k views • 180 slides

Lecture 03: Advanced SQL

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Testing Database Applications

669 views • 52 slides

Testing Database Applications

602 views • 51 slides

More SQL (and Relational Algebra)

More SQL (and Relational Algebra). More SQL. Extended Relational Algebra Outerjoins, Grouping/Aggregation Insert/Delete/Update. The Extended Relational Algebra. ? = eliminate duplicates from bags. ? = sort tuples. ? = grouping and aggregation.

690 views • 50 slides

More SQL

586 views • 50 slides

More SQL

604 views • 48 slides

Constraints

Constraints. Foreign Keys Local and Global Constraints Triggers. Constraints and Triggers. A constraint is a relationship among data elements that the DBMS is required to enforce. Example: key constraints.

607 views • 39 slides

Introduction to SQL

434 views • 37 slides

Bases de Datos Relacionales

496 views • 29 slides

ITEC 334 Fall 2010 Online (Business) Application Development

ITEC 334 Fall 2010 Online (Business) Application Development. Database Review Professor J. Alberto Espinosa. Agenda. Quick review of database design concepts Quick review of SQL SELECT command for queries Learn SQL DELETE, INSERT and UPDATE commands

391 views • 27 slides

CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 06: SQL. Quiz: T/F questions. Subclasses in E/R model have key attributes. In Relational algebra, natural join is one of the five basic operations. A relation in the relational model may have multiple keys.

364 views • 26 slides

More SQL*

Extended Relational Algebra Outerjoins, Grouping/Aggregation Insert/Delete/Update. More SQL*. * Adapted from slides give by H. Molina at Stanford. The Extended Algebra. Arithmetic in projections and selections ? = eliminate duplicates from bags. ? = sort tuples.

336 views • 25 slides

CS411 Database Systems

CS411 Database Systems. Kazuhiro Minami. 06: SQL. Join Expressions. Join Expressions. SQL provides a number of expression forms that act like varieties of join in relational algebra. But using bag semantics, not set semantics.

334 views • 24 slides

Modeling Demand

Modeling Demand . Module 7. Conceptual Structure of SIMQ Market Model. Firm Demand = Total Industry Demand * Share of Market. Firm Demand = Average Firm Demand * n * Share of Market . Firm Demand = Average Firm Demand * Normalized Share of Market. Macro-economic Influences

420 views • 20 slides

Schedule

Schedule. Today (T) Duplicates, Aggregation, Modifications. Read Sections 5.3-5.4, 6.4-6.5. Assignment 3 due. Oct. 18 (TH) Schemas, Views. Read Sections 6.6-6.7. Project Part 3 due. Oct. 23 (T) Constraints. Read Sections 7.1-7.2. Assignment 4 due. Reminder: Midterm is Nov. 1 (TH).

250 views • 18 slides

Union, Intersection, Difference

382 views • 17 slides

Lightar

Lightar. Lightar. Brand New Concept with huge potential in the music education Market. It will be a device to help aspiring musicians to learn the basics and the chords of the guitar lighting up the relevant notes which would allow the person to mimic what is required from the song. Lightar.

220 views • 10 slides

SQL Practice: Henry Books Case

SQL Practice: Henry Books Case. Yong Choi BPA CSUB. SQL 1. Q 1 SELECT BookCode, Title FROM Book; Q 2 SELECT * FROM Publisher; Q 3 SELECT PublisherName FROM Publisher WHERE City='New York';. SQL 2. Q 4 SELECT PublisherName FROM Publisher WHERE NOT City='New York'; Q 5

183 views • 8 slides

Conceptual Structure of Demand Model

TID. RD/N. Conceptual Structure of Demand Model. Firm Demand = Total Industry Demand * Market Share Define Market Share = Firm Demand / Total Industry Demand Market Share = Firm Demand / (Avg. Demand * Number of Firms) Market Share = Relative Demand / Number of Firms

198 views • 4 slides