[1] : The Free On-line Dictionary of Computing (27 SEP 03)

data model
     
         the product of the database design process which
        aims to identify and organize the required data logically and
        physically.
     
        a data model says what information is to be contained in a
        database, how the information will be used, and how the items
        in the database will be related to each other.
     
        for example, a data model might specify that a customer is
        represented by a customer name and credit card number and a
        product as a product code and price, and that there is a
        one-to-many relation between a customer and a product.
     
        it can be difficult to change a database layout once code has
        been written and data inserted.  a well thought-out data model
        reduces the need for such changes.  data modelling enhances
        application maintainability and future systems may re-use
        parts of existing models, which should lower development
        costs.
     
        a data modelling language is a mathematical formalism with a
        notation for describing data structures and a set of
        operations used to manipulate and validate that data.
     
        one of the most widely used methods for developing data models
        is the entity-relationship model.  the relational model is
        the most widely used type of data model.  another example is
        niam.
     
        "principles of database and knowledge-base systems",
        j.d. ullman, volume i, computer science press, 1988, p. 32.
     
        2000-06-24
     
     
see also:
database entity-relationship model relational model niam 

Data Model >> D Words
Data Model, definition of term: Data Model
data+model_pag1.html

Data >> D Words
Data, definition of term: Data
data_pag1.html

Data Path >> D Words
Data Path, definition of term: Data Path
data+path_pag1.html

Data Mining >> D Words
Data Mining, definition of term: Data Mining
data+mining_pag1.html

Data Point >> D Words
Data Point, definition of term: Data Point
data+point_pag1.html

Data Processing >> D Words
Data Processing, definition of term: Data Processing
data+processing_pag1.html

Data Set >> D Words
Data Set, definition of term: Data Set
data+set_pag1.html

Data Rate >> D Words
Data Rate, definition of term: Data Rate
data+rate_pag1.html

Data Warehouse >> D Words
Data Warehouse, definition of term: Data Warehouse
data+warehouse_pag1.html

Data Warehousin >> D Words
Data Warehousin, definition of term: Data Warehousin
data+warehousin_pag1.html

Page 1 2 3 4 Next