database_design
... • Entity integrity deals with within-entity rules. • These rules deal with ranges and the permission of null values in attributes or possibly between records ...
... • Entity integrity deals with within-entity rules. • These rules deal with ranges and the permission of null values in attributes or possibly between records ...
Chapter 3
... • Represents data as twodimensional tables called relations • Relates data across tables based on common data element • Examples: DB2, Oracle, MS SQL Server, MySQL ...
... • Represents data as twodimensional tables called relations • Relates data across tables based on common data element • Examples: DB2, Oracle, MS SQL Server, MySQL ...
Document
... The integration of separate systems into one database resolved these issues, but introduced new ones. With all data shared, control of access to the data becomes a major concern. Payroll doesn’t need to see your grades. ...
... The integration of separate systems into one database resolved these issues, but introduced new ones. With all data shared, control of access to the data becomes a major concern. Payroll doesn’t need to see your grades. ...
Data Warehousing
... Star Schema • Consists of a group of tables that describe the dimensions of the business arranged logically around a huge central table that contains all the accumulated facts and figures of the business. • The smaller, outer tables are points of the star, the larger table the center from which the ...
... Star Schema • Consists of a group of tables that describe the dimensions of the business arranged logically around a huge central table that contains all the accumulated facts and figures of the business. • The smaller, outer tables are points of the star, the larger table the center from which the ...
Chapter 43 – Relational databases
... Suggest foreign keys that could be used to create the relationships. Client ID and Engineer ID Identify four other attributes that the company may store. Client’s details such as company name, address, contact details, make of copier. Engineer details such as name and address. Job details, such as t ...
... Suggest foreign keys that could be used to create the relationships. Client ID and Engineer ID Identify four other attributes that the company may store. Client’s details such as company name, address, contact details, make of copier. Engineer details such as name and address. Job details, such as t ...
Security - Database eLearning
... the data a useless activity by encrypting the data. This means that the data itself is unreadable unless you know a secret code. The encrypted data in combination with the secret key is needed to use the DBMS. • Audit Trails: If someone does penetrate the DBMS, it is useful to find out how they did ...
... the data a useless activity by encrypting the data. This means that the data itself is unreadable unless you know a secret code. The encrypted data in combination with the secret key is needed to use the DBMS. • Audit Trails: If someone does penetrate the DBMS, it is useful to find out how they did ...
Database (1)
... Mohammed Talat Hasan Mubarak 5. Level/year at which this course is offered : 2level / 1 year 6. Co-requisites for this course (if any) ...
... Mohammed Talat Hasan Mubarak 5. Level/year at which this course is offered : 2level / 1 year 6. Co-requisites for this course (if any) ...
VisDB:Multidimensional Data Exploration Tool
... directions of the distance of the data point from the selection predicate. With this method it is possible to provide better feedback to the user. However, we may not be able to use the display efficiently in some cases (I.e. some quadrants may not be used fully, while others are ...
... directions of the distance of the data point from the selection predicate. With this method it is possible to provide better feedback to the user. However, we may not be able to use the display efficiently in some cases (I.e. some quadrants may not be used fully, while others are ...
Wendy Yang
... Runs in server mode: one handler per user; allow many clients connect at the same time. Can be invoked from clients or start separately. Shut down procedure: automatically shutdown when there is no clients; clients send shutdown message. Broadcasting: when database changes state, handler notifies cl ...
... Runs in server mode: one handler per user; allow many clients connect at the same time. Can be invoked from clients or start separately. Shut down procedure: automatically shutdown when there is no clients; clients send shutdown message. Broadcasting: when database changes state, handler notifies cl ...
DATA MODELS in DATABASE MANAGEMENT E. F. Codd IBM
... records from another node and he is able to specify that collection in a single statement, it is absurd for him to engage in a sequence of single record requests, each followed by single record replies. One reason the relational model is in such a dominant position today is that, when originally int ...
... records from another node and he is able to specify that collection in a single statement, it is absurd for him to engage in a sequence of single record requests, each followed by single record replies. One reason the relational model is in such a dominant position today is that, when originally int ...
HW2 due(ch2)
... 1. Which of the following statements is true about business intelligence? A) It is the act of outsourcing tasks, traditionally performed by an employee or contractor, to an undefined, large group of people or community, through the use of information technology. B) It is the process by which a custo ...
... 1. Which of the following statements is true about business intelligence? A) It is the act of outsourcing tasks, traditionally performed by an employee or contractor, to an undefined, large group of people or community, through the use of information technology. B) It is the process by which a custo ...
Census Bureau
... Existing queries need to be changed a lot No normalization technique is used. For small tables, query will run fast but for big tables, there will be a lot of overhead Operational tables will be same in number Too complicated to run queries, may confuse users while joining main and operational table ...
... Existing queries need to be changed a lot No normalization technique is used. For small tables, query will run fast but for big tables, there will be a lot of overhead Operational tables will be same in number Too complicated to run queries, may confuse users while joining main and operational table ...
Midterm - NYU Computer Science
... which are scattered throughout various land and ocean locations to collect basic weather data including air pressure, temperature and precipitation for each hour. All data are sent to the central station which has collected such data for over 10 years. Your design should facilitate efficient queryin ...
... which are scattered throughout various land and ocean locations to collect basic weather data including air pressure, temperature and precipitation for each hour. All data are sent to the central station which has collected such data for over 10 years. Your design should facilitate efficient queryin ...
what is the Database abstraction level?
... accessed, managed, and updated. In one view, databases can be classified according to types of content: full-text, numeric, and images. 2. what is the Database abstraction level? Physical level, Logical level, View level 3. Describe the Data base abstraction level? 1) Physical level. The lowest leve ...
... accessed, managed, and updated. In one view, databases can be classified according to types of content: full-text, numeric, and images. 2. what is the Database abstraction level? Physical level, Logical level, View level 3. Describe the Data base abstraction level? 1) Physical level. The lowest leve ...
Introduction to Database Concepts and Access 2000
... Always consult with your computer security team if you are working with any sensitive data. ...
... Always consult with your computer security team if you are working with any sensitive data. ...
DATABASE ENVIRONMENT
... • Attributes describing properties or qualities of each entity • Relationships between these entities (Staff MANAGES Property) ...
... • Attributes describing properties or qualities of each entity • Relationships between these entities (Staff MANAGES Property) ...
database - CyberInfrastructure and Geospatial Information Laboratory
... o Tuples in a relation are all distinct from each other ...
... o Tuples in a relation are all distinct from each other ...
referential integrity
... if it doesn't exist in the primary key of the related table – For example, you can't assign an order to a customer who is not in the Customer table • You can't delete a record from a table if matching records exist in a related table – For example, you can't delete an employee if there are orders as ...
... if it doesn't exist in the primary key of the related table – For example, you can't assign an order to a customer who is not in the Customer table • You can't delete a record from a table if matching records exist in a related table – For example, you can't delete an employee if there are orders as ...
What is SQL
... What is SQL? SQL is a well know and widely accepted database language. It was first developed at IBM in the mid 1970’s and was known as SEQUEL 2. SQL has been accepted as an ANSI standard which strictly defines the syntax and behaviour of the language. Needless to say there are countless variations ...
... What is SQL? SQL is a well know and widely accepted database language. It was first developed at IBM in the mid 1970’s and was known as SEQUEL 2. SQL has been accepted as an ANSI standard which strictly defines the syntax and behaviour of the language. Needless to say there are countless variations ...
Assessing Structure Quality
... Started in 1971 and now ~61,000 entries, adding ~200 new entries/week. ...
... Started in 1971 and now ~61,000 entries, adding ~200 new entries/week. ...
Chapter 1: Introduction
... e.g., the database consists of information about a set of customers and accounts and the relationship between them) Expressed in some data model Occurs at multiple levels Logical schema: database design at the logical level ...
... e.g., the database consists of information about a set of customers and accounts and the relationship between them) Expressed in some data model Occurs at multiple levels Logical schema: database design at the logical level ...
Public Management: Concepts and Big Questions
... information when designing conceptual schemas, each department and application has its own schemas Database administrator’s role in ensuring security in response to evolving threats. ...
... information when designing conceptual schemas, each department and application has its own schemas Database administrator’s role in ensuring security in response to evolving threats. ...
Building CASE Tools Data Base Using Microsoft SQL
... • A database: is a collection of related data, organized into entities called tables that are connected together by relationships. • A Table: is a part of the database that contains related information about a certain entity (Students, Teachers, Faculties, etc.). A table consists of fields that repr ...
... • A database: is a collection of related data, organized into entities called tables that are connected together by relationships. • A Table: is a part of the database that contains related information about a certain entity (Students, Teachers, Faculties, etc.). A table consists of fields that repr ...