投影片 1
... Proposed by Peter Chen (BS NTU EE ‘68) in 1976 popular for conceptual design Relational model Object-oriented model ...
... Proposed by Peter Chen (BS NTU EE ‘68) in 1976 popular for conceptual design Relational model Object-oriented model ...
Competencies for Information Management
... Time-consuming to incorporate new data definitions ...
... Time-consuming to incorporate new data definitions ...
Chapter 7
... Associate Professor in Business Technology Management John Molson School of Business, Concordia University, Montréal ...
... Associate Professor in Business Technology Management John Molson School of Business, Concordia University, Montréal ...
Why Databases??
... Database design in E-R model usually converted to design in the relational model (coming up next) which is used for storage and processing ...
... Database design in E-R model usually converted to design in the relational model (coming up next) which is used for storage and processing ...
COMPUTING FOR BUSINESS AND ECONOMICS-III
... two possible views, one of interest to a benefits specialist and one of interest to a member of the company’s payroll department. ...
... two possible views, one of interest to a benefits specialist and one of interest to a member of the company’s payroll department. ...
Ch04r
... informational sources in a single repository or access point that is suitable for direct querying, analysis, or processing. • Data marts: Small-scale data warehouses that contain a sub-set of the data for a single aspect of a company’s business (for example, finance, inventory, or personnel). • Data ...
... informational sources in a single repository or access point that is suitable for direct querying, analysis, or processing. • Data marts: Small-scale data warehouses that contain a sub-set of the data for a single aspect of a company’s business (for example, finance, inventory, or personnel). • Data ...
Introduction to ERwin
... • “Always” use Integer and Identity(1,1) for Primary Keys. Use UNIQUE constraint for other columns that needs to be unique, e.g. “RoomNumber” • Specify Required Columns (NOT NULL) – i.e., which columns that need to have data or not ...
... • “Always” use Integer and Identity(1,1) for Primary Keys. Use UNIQUE constraint for other columns that needs to be unique, e.g. “RoomNumber” • Specify Required Columns (NOT NULL) – i.e., which columns that need to have data or not ...
Introduction to Databases
... You could ignore it, but it costs you time. Place the Burden on your customer or user. Have the programmers “fix the problem” Place the burden on the Database Management System (DBMS) • Temporal integrity is one of the key challenges of Address Database management. ...
... You could ignore it, but it costs you time. Place the Burden on your customer or user. Have the programmers “fix the problem” Place the burden on the Database Management System (DBMS) • Temporal integrity is one of the key challenges of Address Database management. ...
Database Design
... DBMS decides whether or not to use an index DBMS maintains all indexes (modifications incur cost) Table scans can be avoided through index usage Recommended on foreign key columns to speed RI access Indexes can minimize sorting There can be multiple indexes per table to suit the way data is processe ...
... DBMS decides whether or not to use an index DBMS maintains all indexes (modifications incur cost) Table scans can be avoided through index usage Recommended on foreign key columns to speed RI access Indexes can minimize sorting There can be multiple indexes per table to suit the way data is processe ...
jessupch03 - U of L Class Index
... • Provides several pieces of information about each attribute in the database including: - Name - Key (is it a key or part of a key?) - Data Type (date, alphanumeric, numeric, etc.) - Valid Value (the format or numbers allowed) • Can be used to enforce Business Rules which are captured by the databa ...
... • Provides several pieces of information about each attribute in the database including: - Name - Key (is it a key or part of a key?) - Data Type (date, alphanumeric, numeric, etc.) - Valid Value (the format or numbers allowed) • Can be used to enforce Business Rules which are captured by the databa ...
Database Study Guide Part I
... returned or marked as “lost” and paid for so a replacement can be purchased. So although we don’t actually see database information in front of us, one is probably being used in almost every aspect of our lives. ...
... returned or marked as “lost” and paid for so a replacement can be purchased. So although we don’t actually see database information in front of us, one is probably being used in almost every aspect of our lives. ...
Advanced Database Management Systems CS424 2016 Jan – May
... The practical work done in the course goes through usage of some advanced SQL features and the implementation of some algorithms and coding of internals of an actual database system. Students should already know how to write queries and design databases. The course will build further on these to inc ...
... The practical work done in the course goes through usage of some advanced SQL features and the implementation of some algorithms and coding of internals of an actual database system. Students should already know how to write queries and design databases. The course will build further on these to inc ...
Databases and Management Systems Working with a Database
... management system (DBMS). • List three tasks that a DBMS enables users to do. • Differentiate between flat-file databases and relational databases. • List three steps needed to create a database. ...
... management system (DBMS). • List three tasks that a DBMS enables users to do. • Differentiate between flat-file databases and relational databases. • List three steps needed to create a database. ...
Data Models - a.thanop somprasong
... Sometimes called top-down or parent-child structure model Developed in the 1960s to manage large amounts of data for manufacturing projects Basic logical structure is represented by an upside-down “tree” (Tree-like structure) Hierarchical structure contains levels or segments Segment analogous to ...
... Sometimes called top-down or parent-child structure model Developed in the 1960s to manage large amounts of data for manufacturing projects Basic logical structure is represented by an upside-down “tree” (Tree-like structure) Hierarchical structure contains levels or segments Segment analogous to ...
relational database with sql and graph database
... hypertext which forced people working on graph databases to move to particular applications like spatial data, Web, and documents; the tree-like structure was enough for most applications at that time. A number of papers have been published on graph databases during the 70’s and 80’s in early appr ...
... hypertext which forced people working on graph databases to move to particular applications like spatial data, Web, and documents; the tree-like structure was enough for most applications at that time. A number of papers have been published on graph databases during the 70’s and 80’s in early appr ...
Chapter 7 Practice 1- Presenting the Group Project
... A (maximum) 10 minute presentation to the class. Class time, however, may limit the presentations to three groups (drawn by lot). Describe the physical problem and database design (the tables and relationships) that will be used to implement the system. Illustrate the type of information to be obtai ...
... A (maximum) 10 minute presentation to the class. Class time, however, may limit the presentations to three groups (drawn by lot). Describe the physical problem and database design (the tables and relationships) that will be used to implement the system. Illustrate the type of information to be obtai ...
ORDBMS
... • Often hidden from user • But can be made visible • can be SYSTEM GENERATED – like an OID ...
... • Often hidden from user • But can be made visible • can be SYSTEM GENERATED – like an OID ...
Khan - EECS
... Data Model for Semi-Structured Data • Characteristics of Semi-Structured Data – Schema is not given in advance, may be implicit – Schema is relatively large and may be changing frequently – Schema is descriptive rather than perspective – Data is not strongly typed ...
... Data Model for Semi-Structured Data • Characteristics of Semi-Structured Data – Schema is not given in advance, may be implicit – Schema is relatively large and may be changing frequently – Schema is descriptive rather than perspective – Data is not strongly typed ...
RPPA12_poster - MKS 2
... database is used as a common repository, Each application (corresponding to different configuration files) has a different set of tables defined in the database. ...
... database is used as a common repository, Each application (corresponding to different configuration files) has a different set of tables defined in the database. ...
EXTENSII ALE BAZELOR DE DATE DISTRIBUITE / SYSTEMS
... systems and considering them as a guaranteed solution, even if some cases prove this is not the most efficient approach. We will try to fight against to this preconceived idea trough reveal of some technologies as federated database systems, which are applicable in some categories of circumstances. ...
... systems and considering them as a guaranteed solution, even if some cases prove this is not the most efficient approach. We will try to fight against to this preconceived idea trough reveal of some technologies as federated database systems, which are applicable in some categories of circumstances. ...
CPS 216: Advanced Database Systems
... Teaching/Learning Methodology Relational database management systems ...
... Teaching/Learning Methodology Relational database management systems ...
CPS 216: Advanced Database Systems
... Teaching/Learning Methodology Relational database management systems ...
... Teaching/Learning Methodology Relational database management systems ...
Exam 2003 (sat by internal students)
... database consists of ticket number and payment details. It would be useful to also have recorded in the database the time when the booking was made and the name of the staff member who performed the operation. The information required for each passenger consists of name, contact details these are ...
... database consists of ticket number and payment details. It would be useful to also have recorded in the database the time when the booking was made and the name of the staff member who performed the operation. The information required for each passenger consists of name, contact details these are ...
microsoft access - Calhoun County Schools
... will show on the right side of the screen • The object bar to create new objects is on the left of the screen • Data is organized into separate storage containers called tables. ...
... will show on the right side of the screen • The object bar to create new objects is on the left of the screen • Data is organized into separate storage containers called tables. ...
Database model
A database model is a type of data model that determines the logical structure of a database and fundamentally determines in which manner data can be stored, organized, and manipulated. The most popular example of a database model is the relational model, which uses a table-based format.