'Different relations' diaporamas de présentation

Chapter 6 DATABASES, DATA WAREHOUSES AND OLAP

Chapter 6 DATABASES, DATA WAREHOUSES AND OLAP. Cios / Pedrycz / Swiniarski / Kurgan. Outline. Introduction Database Management Systems and SQL Architecture of Database Management Systems Introduction to SQL Data Retrieval with SQL Select Command Aggregate Functions View Command

1.33k views • 109 slides

Revision for Final Exam

CS157A Lecture 25. Revision for Final Exam. Prof. Sin-Min Lee Department of Computer Science. Relational Query Languages. Languages for describing queries on a relational database Structured Query Language (SQL) Predominant application-level query language Declarative Relational Algebra

816 views • 73 slides

Canadians: What do They Want?

Canadians: What do They Want?. Margaret Atwood. Margaret Atwood. Born Nov. 18, 1939 Canadian Atwood is among the most-honored authors of fiction in recent history . Booker Prize, Arthur C. Clarke Award, and Governor General's Award.

1.63k views • 36 slides

The Relational Model

The Relational Model. Review. Why use a DBMS? OS provides RAM and disk. Review. Why use a DBMS? OS provides RAM and disk Concurrency Recovery Abstraction, Data Independence Query Languages Efficiency (for most tasks) Security Data Integrity. Data Models. DBMS models real world

360 views • 26 slides

ACT from bottom up

376 views • 25 slides

To start learning RFT

387 views • 24 slides

Events

358 views • 19 slides

ICS 321 Fall 2011 Normal Forms (ii)

ICS 321 Fall 2011 Normal Forms (ii). Asst. Prof. Lipyeow Lim Information & Computer Science Department University of Hawaii at Manoa. Redundancies & Decompositions. Hourly_Emps. Hourly_Emps. RatingWages. Decompositions.

310 views • 16 slides

Relations & Their Properties: Selected Exercises

Relations & Their Properties: Selected Exercises. 10. Which relations in Exercise 4 are irreflexive? A relation is irreflexive ? ? a ? A (a, a) ? R. Ex. 4 relations on the set of all people: a is taller than b . a and b were born on the same day. a has the same first name as b .

262 views • 13 slides