All Topics  
Bachman diagram

 

 
   Email Print
   Bookmark   Link
 

 

Bachman diagram
 
 
  Topics Bachman diagram Topic Home

Bachman diagrams are diagram
Diagram

A diagram is a 2D geometric model symbolic representation of information according to some visualization technique. Sometimes, the technique uses a Three-dimensional space visualization which is then graphical projection onto the 2D surface....
s which are used to design the data
DATA

Debt, AIDS, Trade in Africa is a multinational Non-governmental organization founded in January 2002 in London by U2's Bono along with Robert Sargent Shriver III and activists from the Jubilee 2000 Drop the Debt campaign....
 using a network or relational "logical" model, separating the data model
Data model

A data model in software engineering is an abstract model that describes how Data is represented and accessed. Data models formally define data elements and relationships among data elements for a domain of interest....
 from the way the data is stored in the system. The model is named after database pioneer Charles Bachman
Charles Bachman

Charles William Bachman is an American computer scientist, who spent his entire career as an industrial researcher rather than in academia. He is particularly known for his work in the area of databases....
, and mostly used in computer software design
Software design

Software design is a process of problem-solving and planning for a software solution. After the purpose and specifications of software are determined, software developers will design or employ designers to develop a plan for a solution....
. A bachman diagram is another name for a data structure diagram
Data structure diagram

A Data Structure Diagram is a data model used to describe Conceptual schema by providing graphical notations which document entity and their Relational models, and the constraints that binds them....
.

In a relational model a relation is the cohesion of attributes that are fully and not transitive functional dependent of every key in that relation.






Discussion
Ask a question about 'Bachman diagram'
Start a new discussion about 'Bachman diagram'
Answer questions from other users
Full Discussion Forum



Encyclopedia


Bachman diagrams are diagram
Diagram

A diagram is a 2D geometric model symbolic representation of information according to some visualization technique. Sometimes, the technique uses a Three-dimensional space visualization which is then graphical projection onto the 2D surface....
s which are used to design the data
DATA

Debt, AIDS, Trade in Africa is a multinational Non-governmental organization founded in January 2002 in London by U2's Bono along with Robert Sargent Shriver III and activists from the Jubilee 2000 Drop the Debt campaign....
 using a network or relational "logical" model, separating the data model
Data model

A data model in software engineering is an abstract model that describes how Data is represented and accessed. Data models formally define data elements and relationships among data elements for a domain of interest....
 from the way the data is stored in the system. The model is named after database pioneer Charles Bachman
Charles Bachman

Charles William Bachman is an American computer scientist, who spent his entire career as an industrial researcher rather than in academia. He is particularly known for his work in the area of databases....
, and mostly used in computer software design
Software design

Software design is a process of problem-solving and planning for a software solution. After the purpose and specifications of software are determined, software developers will design or employ designers to develop a plan for a solution....
. A bachman diagram is another name for a data structure diagram
Data structure diagram

A Data Structure Diagram is a data model used to describe Conceptual schema by providing graphical notations which document entity and their Relational models, and the constraints that binds them....
.

In a relational model a relation is the cohesion of attributes that are fully and not transitive functional dependent of every key in that relation. The coupling between the relations is based on accordant attributes. For every relation a rectangle has to be drawn and every coupling is illustrated by a line that connects the relations. On the edge of each line arrows indicate the cardinality. We have 1-to-n, 1-to-1 and n-to-m. The latter has to be avoided and must be replaced by two 1-to-n couplings.

See also

  • Entity-relationship model
    Entity-relationship model

    An Entity-Relationship Model in software engineering is an abstract and conceptual representation of data. Entity-relationship modeling is a relational schema database modeling method, used to produce a type of conceptual schema or semantic data model of a system, often a relational database, and its requirements in a top-down fashion....