• Study Resource
  • Explore
    • Arts & Humanities
    • Business
    • Engineering & Technology
    • Foreign Language
    • History
    • Math
    • Science
    • Social Science

    Top subcategories

    • Advanced Math
    • Algebra
    • Basic Math
    • Calculus
    • Geometry
    • Linear Algebra
    • Pre-Algebra
    • Pre-Calculus
    • Statistics And Probability
    • Trigonometry
    • other →

    Top subcategories

    • Astronomy
    • Astrophysics
    • Biology
    • Chemistry
    • Earth Science
    • Environmental Science
    • Health Science
    • Physics
    • other →

    Top subcategories

    • Anthropology
    • Law
    • Political Science
    • Psychology
    • Sociology
    • other →

    Top subcategories

    • Accounting
    • Economics
    • Finance
    • Management
    • other →

    Top subcategories

    • Aerospace Engineering
    • Bioengineering
    • Chemical Engineering
    • Civil Engineering
    • Computer Science
    • Electrical Engineering
    • Industrial Engineering
    • Mechanical Engineering
    • Web Design
    • other →

    Top subcategories

    • Architecture
    • Communications
    • English
    • Gender Studies
    • Music
    • Performing Arts
    • Philosophy
    • Religious Studies
    • Writing
    • other →

    Top subcategories

    • Ancient History
    • European History
    • US History
    • World History
    • other →

    Top subcategories

    • Croatian
    • Czech
    • Finnish
    • Greek
    • Hindi
    • Japanese
    • Korean
    • Persian
    • Swedish
    • Turkish
    • other →
 
Profile Documents Logout
Upload
KorthDB6_ch7
KorthDB6_ch7

... The phases of the database design  Understanding the needs of users and enterprises  Conceptual design using the abstract model like ER Model  Specification of functional requirements (operations & transactions)  Converting the abstract model to implementation details  Logical design phase: con ...
Relationship Sets
Relationship Sets

... relationship set by a number of distinct binary relationship sets, a n-ary relationship set shows more clearly that several entities participate in a single relationship.  Placement of relationship attributes ...
Table of Content - California State University, Long Beach
Table of Content - California State University, Long Beach

... (1) finds a MATCH in the referenced table, OR (2) is NULL. (In other words, we do not want to reference something that does not exist.) ...
Developing an ODBC C++ Client with MySQL
Developing an ODBC C++ Client with MySQL

... I am going to assume you already know how to code in C++ and have worked with a database before and understand some SQL. Although we are not using any SQL in the development of our front end client, it will be helpful and required for anyone wanting to learn C++ ODBC database development. You will a ...
Recommended Fix - dbmanagement.info
Recommended Fix - dbmanagement.info

...  A significant percentage of queries must get benefit from access to the denormalized column in order to justify movement into the claim line table.  Need to quantify both cost and benefit of each ...
INTRODUCTION TO RDBMS
INTRODUCTION TO RDBMS

... The relational model originated from a paper authored by Dr.codd entitled “A Relational Model of Data for Large Shared Data Banks”, written in 1970. This paper included the following concepts that apply to database management systems for relational databases. The relation is the only data structure ...
ch6
ch6

...  If an entity can belong to at most one lower-level entity set then that relationship is said to be disjoint.  If an entity can belong to more than one lower-level entity set then that relationship is said to be overlapping.  If an entity must belong to one of the lower-level entity sets then tha ...
SQL - STATUS
SQL - STATUS

... X/Open SQL Call Level Interface Allows any of the ILE languages to access SQL functions directly through procedure calls to a service program provided by the system. Using this interface, one can perform all the SQL functions without the need for a precompile. „ It is ideally suited for a client-se ...
TAMEX: a Task-Based Query Execution Framework for Mixed
TAMEX: a Task-Based Query Execution Framework for Mixed

... sales items left , sales items right ...
On the Information Content of Semi-Structured
On the Information Content of Semi-Structured

... objects and ignore the wider issues of object-orientation in databases.) The hypernode model, as are other semi-structured models [Abi97, Bun97], is more general than the above extensions to the flat relational model, and in the sequel we will define suitable restrictions of hypernode databases that ...
transformation - Program
transformation - Program

... compositional property of transformations (the composition of two transformations still is a transformation) ...
Document
Document

... second foreach loop, the query will go to the database a second time – To prevent this, copy the result of the query with ToList() or ToArray() and iterate over the copy ...
No Slide Title
No Slide Title

New SQL Features in Firebird
New SQL Features in Firebird

Oracle Database: Develop PL/SQL Program Units
Oracle Database: Develop PL/SQL Program Units

... Ensure fast, reliable, secure and easy to manage performance. Optimize database workloads, lower IT costs and deliver a higher quality of service by enabling consolidation onto database clouds. Learn Dynamic SQL, Design Considerations and More This course will also teach you how to use Dynamic SQL t ...
Chapter 21:Application Development and Administration
Chapter 21:Application Development and Administration

...  Rules and Other Active-Database Features ...
Start - New4schools
Start - New4schools

... Which two of the following statements about the layout of data fields and headers are true? Group records in this report by employee’s first name with employee’s lastname display in alphabetical order. Click finish when you have finish. We need this report to sort results by firstname order and tell ...
Insert, Update and Delete in Access
Insert, Update and Delete in Access

... application that will start automatically when your computer starts and keep running always). Your program (software) which need to access the database will not access the database file directly. Instead, your program will communicate with the database service application. It is the responsibility o ...
Presentation PPS
Presentation PPS

... For some applications with large tables, this presents a choice between a poor plan and a high cost of compilation SQL Server 2005 offers asynchronous auto ...
Owner of the content within this article is www
Owner of the content within this article is www

... Next we must execute the SQL script from Forefront TMG to create the required tables, views and fields for the SQL Server database. Start the SQL Server Management Studio application and start a new query and paste the entire SQL script into the query editor and execute the query. To the same for th ...
PHP and MySQL - University of Alabama
PHP and MySQL - University of Alabama

... to do 1) must read in values into C/C++ variables then use those values to insert using SQL still need SQL statement to insert, select tuples ...
3. Temporal Specialization and Generalization
3. Temporal Specialization and Generalization

... when it ceased to be current. Consequently, a rollback relation is ever-growing. While a rollback relation reflects the history of update activities, an historical relation models the part of reality modeled by the database. A fact in such a relation has a valid time only. Finally, a fact in a tempo ...
SBA (Stack-Based Approach) and SBQL (Stack
SBA (Stack-Based Approach) and SBQL (Stack

... select Name, DeptName from Employee, Dept where some_predicate ...
11_TransactionMgmt_S..
11_TransactionMgmt_S..

... exclusive (X) lock: Data item can be both read as well as written by just one transaction  shared (S) lock: Data item can only be read (but shared by transactions) ...
New SQL Performance Optimizations to Enhance Your SAS® Client and Solution Access to the Database
New SQL Performance Optimizations to Enhance Your SAS® Client and Solution Access to the Database

... does the increased response time required to fetch the data translate into greater expense for the customer, the additional disk and memory space to store the data adds to the expense as well. As the integration of SAS software with external databases expands and the popularity of using formatted da ...
< 1 ... 5 6 7 8 9 10 11 12 13 ... 141 >

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.
  • studyres.com © 2025
  • DMCA
  • Privacy
  • Terms
  • Report