| slovo | definícia |
relational data 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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