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PowerPoint 97
PowerPoint 97

... • An attribute value must match its type. • A primary key must be unique. • A tuple’s foreign key must be of the same type as its “matching” primary key. • To create a record with a given foreign key, a record in the corresponding table must have that value as its primary key. • Many to many relatio ...
ppt - CSE, IIT Bombay
ppt - CSE, IIT Bombay

... hash key based on the value of the join attribute (Listen) use newData to see the rehashed tuples (Compute) Run standard one-site join algorithm on the tuples as they arrive ...
Chapter 8
Chapter 8

... ORDER BY specifies an order for displaying the result of a query  A query is evaluated by first applying the WHERE-clause, then GROUP BY and HAVING, and finally the SELECTclause Slide 8- 10 ...
Lecture 3
Lecture 3

... • Relation is a table of n columns and m rows., Referred to as: m x n • rows define CARDINALITY (m), cols define DEGREE (n) • relations are represented as: • relation (attribute names..) • ex; • STUDENT (student name, student ss#, student address, GPA) ...
Lecture 3
Lecture 3

... • Relation is a table of n columns and m rows., Referred to as: m x n • rows define CARDINALITY (m), cols define DEGREE (n) • relations are represented as: • relation (attribute names..) • ex; • STUDENT (student name, student ss#, student address, GPA) ...
ch5c - UCLA Computer Science
ch5c - UCLA Computer Science

Transaction Time
Transaction Time

TupleSpaces Revisited: Linda to TSpace
TupleSpaces Revisited: Linda to TSpace

... • Use XML as query specifiers – TSpaces can parse XML documents, and form intelligent queries as a result, replacing missing fields with wildcards ...
Document
Document

... All records are the same length (ie. Owner records are all Character & 38 characters wide) Field- Defines where a particular type of data can be found. Also referred to as a variable or column. - A Key field is a designated field used to locate or sort records. - There be more than one key field. - ...
CS 561 Database Management Systems Syllabus
CS 561 Database Management Systems Syllabus

... The syllabus below describes a recent offering of the course, but it may not be completely up to date. For current details about this course, please contact the course coordinator. Course coordinators are listed on the course listing for undergraduate courses and graduate courses. ...
Probabilistic Ranking of Database Query Results
Probabilistic Ranking of Database Query Results

Chapter 1: Introduction
Chapter 1: Introduction

... Relational Query Languages  Language in which user requests information from the database.  Categories of languages ...
Query Processing - Department of Computer Science
Query Processing - Department of Computer Science

... Until now, our concept of database has been one in which programs accessing the database are run one at a time (serially). Often this is indeed the case. However, there are also numerous applications in which more than one program, or different executions of the same program, run simultaneously (con ...
Induction slides
Induction slides

... course in databases) 2 lectures & 1 exercise class / week Weekly exercise sheets [unassessed; but IF YOU DO THEM you receive feedback on these] ...
Mid term
Mid term

... STUDENT table, the StudentNumber column must be unique (to prevent two different students from having the same StudentNumber). Identify the column or the group of columns in the other tables that must be unique across all rows in the table? Chapter 3: 14. Why are tuples in a relation not ordered? 15 ...
Module 2
Module 2

Transaction Time - UCLA Computer Science
Transaction Time - UCLA Computer Science

... Retain simplicity of the relational model: Strict superset of the relational model ...
Relational Databases - U of W ACS Homepage
Relational Databases - U of W ACS Homepage

...  A relational database comprises relations  Common name for relation is table  Structure: a table is a collection of rows and columns  Structure resembles appearance of some spreadsheets  everybody is familiar with tables  this simplicity is one reason why relational databases have been very s ...
slides - CIS @ Temple University
slides - CIS @ Temple University

... Database System Concepts, 6th Ed. ©Silberschatz, Korth and Sudarshan See www.db-book.com for conditions on re-use ...
Admin
Admin

... Databases 2 ...
Database Systems: Design, Implementation, and Management
Database Systems: Design, Implementation, and Management

... attribute (or a combination of attributes) in one table whose values must either match the primary key values in a designated table or be null.  Used to logically link one table with another (compare with the physical pointers in Hierarchical and Network models).  Enforces Referential Integrity (G ...
Lecture 3
Lecture 3

... required-memory, educational-method) ...
No Slide Title
No Slide Title

... • The fundamental operations in relational algebra are: - Select -Project -Assign -Union - Set Difference - Cartesian Product - Rename [There are other operations as well.] • In relational algebra, the input to an operation is one or two relations (or tables) , and the output of an operation is one ...
Slides - Computer Science - University of Birmingham
Slides - Computer Science - University of Birmingham

... querying, creating and updating tables. See manual and textbook for much more if you want! ...
Data Structure Database - Tufts Computer Science
Data Structure Database - Tufts Computer Science

... • Think of ODBC (Open Database Connectivity) and JDBC as a device driver / API • Just like a printer driver: 1. For each printer (database software), you need to install a specific driver 2. Once the driver is installed, your software talks it the printer (database) via a common API / interface 3. T ...
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Relational algebra

Relational algebra, first described by E.F. Codd while at IBM, is a family of algebra with a well-founded semantics used for modelling the data stored in relational databases, and defining queries on it.The main application of relational algebra is providing a theoretical foundation for relational databases, particularly query languages for such databases, chief among which is SQL.
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