| slovo | definícia |
relational model
(foldoc) | relational data model
relational model
(Or "relational model") A data model introduced
by E.F. Codd in 1970, particularly well suited for business
data management. In this model, data are organised in
tables. The set of names of the columns is called the
"schema" of the table.
Here is an example table with the schema (account number,
amount) and 3 lines.
account number amount
-------------- ---------
12343243546456 +30000.00
23149875245824 +2345.33
18479827492874 -123.25
The data can be manipulated using a relational algebra.
SQL is a standard language for talking to a database built
on the relational model (a "relational database").
["A relational model for large shared data banks"
Communications of ACM 13:6, pp 377-387].
(1998-10-05)
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| | podobné slovo | definícia |
object relational modelling
(foldoc) | object relational mapping
object relational modelling
(ORM) The software development activity
that defines a correspondence between objects in a program and
rows in a database table. Atomic object properties
correspond to columns in the table, non-atomic data types and
relations between objects are represented as foreign keys
referring to other tables.
An object persistence mechanism is responsible for maintaining
the correspondence between objects and the database contents at
run-time.
(2014-12-03)
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