'Sort key' diaporamas de présentation

Concepts of Database Management Seventh Edition

Concepts of Database Management Seventh Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

658 views • 52 slides

Concepts of Database Management Sixth Edition

Concepts of Database Management Sixth Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

623 views • 51 slides

Concepts of Database Management Sixth Edition

Concepts of Database Management Sixth Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

686 views • 51 slides

Concepts of Database Management Sixth Edition

Concepts of Database Management Sixth Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

530 views • 51 slides

Concepts of Database Management Seventh Edition

Concepts of Database Management Seventh Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

541 views • 51 slides

A Guide to SQL, Eighth Edition

A Guide to SQL, Eighth Edition. Chapter Four Single-Table Queries. Objectives. Retrieve data from a database using SQL commands Use simple and compound conditions in queries Use the BETWEEN, LIKE, and IN operators in queries Use computed columns in queries. Objectives (continued).

495 views • 49 slides

A Guide to MySQL

4. A Guide to MySQL. Objectives. Retrieve data from a database using SQL commands Use compound conditions in queries Use computed columns in queries Use the SQL LIKE operator Use the SQL IN operator Sort data using the ORDER BY clause. Objectives (continued).

559 views • 48 slides

Concepts of Database Management Seventh Edition

Concepts of Database Management Seventh Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Relational Databases. A relational database is a collection of tables Each entity is stored in its own table

620 views • 44 slides

Concepts of Database Management Seventh Edition

Concepts of Database Management Seventh Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

532 views • 40 slides

Concepts of Database Management Seventh Edition

Concepts of Database Management Seventh Edition. Chapter 2 The Relational Model 1: Introduction, QBE, and Relational Algebra. Objectives. Describe the relational model Understand Query-By-Example (QBE) Use criteria in QBE Create calculated columns in QBE Use functions in QBE.

539 views • 40 slides

C-Store: Data Model and Data Organization

C-Store: Data Model and Data Organization. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY May 17, 2010. Data Model: standard relational model. A database: A set of named relations (tables) A relation A set of named attributes (columns) Primary key

464 views • 38 slides

C-Store: Data Model and Data Organization

C-Store: Data Model and Data Organization. Jianlin Feng School of Software SUN YAT-SEN UNIVERSITY Mar 6, 2009. Data Model: standard relational model. A database: A set of named relations (tables) A relation A set of named attributes (columns) Primary key

461 views • 38 slides

CSCE 310 / 608 Database Systems

CSCE 310 / 608 Database Systems. Chapter 15: Query Execution. Query Processing. Query Execution One-Pass Algorithms. One Pass, Binary Operations. Bag union: copy every tuple of R to the output, then copy every tuple of S to the output only needs M ? 1

422 views • 32 slides

Query Processing

Query Processing. Two-Pass Algorithms. Source: our textbook. Nested-Loop Joins. Another helpful primitive. Main idea to join relations R and S : for each tuple s in S do for each tuple r in R do if r and s match then ouput the join of r and s How to optimize this?.

381 views • 31 slides

Querying a Database Access Project 2

Querying a Database Access Project 2. What is a Query?. In general, a query is a form of questioning, in a line of inquiry. A query may also refer to:

399 views • 30 slides

The University of Akron Dept of Business Technology Computer Information Systems

The University of Akron Dept of Business Technology Computer Information Systems. The Relational Model: Query-By-Example (QBE). 2440: 180 Database Concepts Instructor: Enoch E. Damson. Query-by-Example (QBE). Query Questions represented in a way the DBMS can recognize and process QBE

410 views • 29 slides

QUERYING A DATABASE

QUERYING A DATABASE. By: Dr.Ennis-Cole. OBJECTIVES:. Learn how to use the Query window in Design view Create, run and Save queries Define a relationship between two tables Sort data in a query Filter data in a query Specify an exact match condition in a query. OBJECTIVES:.

300 views • 20 slides

Microsoft Access 2002

271 views • 18 slides

Two-Pass Algorithms Based on Sorting

Two-Pass Algorithms Based on Sorting. Prepared By: Ronak Shah ID: 116. Introduction. In two-pass algorithms, data from the operand relations is read into main memory, processed in some way, written out to disk again, and then reread from disk to complete the operation.

244 views • 12 slides