| slovo | definícia |
relational
(encz) | relational,relační adj: Zdeněk Brož |
Relational
(gcide) | Relational \Re*la"tion*al\ (r?-l?"sh?n-al), a.
1. Having relation or kindred; related.
[1913 Webster]
We might be tempted to take these two nations for
relational stems. --Tooke.
[1913 Webster]
2. Indicating or specifying some relation.
[1913 Webster]
Relational words, as prepositions, auxiliaries, etc.
--R. Morris.
[1913 Webster] |
relational
(wn) | relational
adj 1: having a relation or being related |
| | podobné slovo | definícia |
correlational
(encz) | correlational,korelační adj: Zdeněk Brožcorrelational,korelativní adj: Zdeněk Brožcorrelational,souvztažný adj: Zdeněk Brož |
correlational analysis
(encz) | correlational analysis, n: |
correlational statistics
(encz) | correlational statistics, n: |
relational adjective
(encz) | relational adjective, n: |
relational database
(encz) | relational database,relační databáze n: [it.] IvČa |
relational database management system
(encz) | relational database management system, n: |
relationally
(encz) | relationally,příbuzensky adv: Zdeněk Brož |
Relational
(gcide) | Relational \Re*la"tion*al\ (r?-l?"sh?n-al), a.
1. Having relation or kindred; related.
[1913 Webster]
We might be tempted to take these two nations for
relational stems. --Tooke.
[1913 Webster]
2. Indicating or specifying some relation.
[1913 Webster]
Relational words, as prepositions, auxiliaries, etc.
--R. Morris.
[1913 Webster] |
correlational
(wn) | correlational
adj 1: relating to or employing correlation |
correlational analysis
(wn) | correlational analysis
n 1: the use of statistical correlation to evaluate the strength
of the relations between variables |
correlational statistics
(wn) | correlational statistics
n 1: a statistical relation between two or more variables such
that systematic changes in the value of one variable are
accompanied by systematic changes in the other [syn:
correlation, correlational statistics] |
relational adjective
(wn) | relational adjective
n 1: an adjective that classifies its noun (e.g., `a nervous
disease' or `a musical instrument') [syn: {relational
adjective}, classifying adjective] |
relational database
(wn) | relational database
n 1: a database in which relations between information items are
explicitly specified as accessible attributes; "in a
relational database the data are organized as a number of
differently sized tables" |
relational database management system
(wn) | relational database management system
n 1: a database management system designed to manage a
relational database |
multics relational data store
(foldoc) | Multics Relational Data Store
MRDS
(MRDS) The first commercial relational database,
implemented as part of Multics by Jim Weeldreyer and Oris
Friesen of Honeywell Phoenix in about 1977. MRDS included a
report writer called LINUS written by Jim Falksen.
(1997-01-29)
|
object relational mapping
(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)
|
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)
|
relational algebra
(foldoc) | relational algebra
A family of algebra with a well-founded
semantics used for modelling the data stored in {relational
databases}, and defining queries on it. The main operations
of the relational algebra are the set operations (such as
union, intersection, and cartesian product), selection
(keeping only some lines of a table) and the projection
(keeping only some columns).
The relational data model describes how the data is
structured.
Codd's reduction algorithm can convert from {relational
calculus} to relational algebra.
(1997-02-17)
|
relational calculus
(foldoc) | relational calculus
An operational methodolgy, founded on {predicate
calculus}, dealing with descripitive expressions that are
equivalent to the operations of relational algebra. {Codd's
reduction algorithm} can convert from relational calculus to
relational algebra.
Two forms of the relational calculus exist: the {tuple
calculus} and the domain calculus.
["An Introduction To Database Systems" (6th ed), C. J. Date,
Addison Wesley].
(1998-10-05)
|
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)
|
relational database
(foldoc) | relational database
RDBMS
relational database management system
relational DBMS
(RDBMS - relational database management system) A
database based on the relational model developed by
E.F. Codd. A relational database allows the definition of
data structures, storage and retrieval operations and
integrity constraints. In such a database the data and
relations between them are organised in tables. A table is
a collection of rows or records and each row in a table
contains the same fields. Certain fields may be designated
as keys, which means that searches for specific values of
that field will use indexing to speed them up.
Where fields in two different tables take values from the same
set, a join operation can be performed to select related
records in the two tables by matching values in those fields.
Often, but not always, the fields will have the same name in
both tables. For example, an "orders" table might contain
(customer_id, product_code) pairs and a "products" table might
contain (product_code, price) pairs so to calculate a given
customer's bill you would sum the prices of all products
ordered by that customer by joining on the product-code fields
of the two tables. This can be extended to joining multiple
tables on multiple fields. Because these relationships are
only specified at retreival time, relational databases are
classed as dynamic database management system.
The first commercial RDBMS was the {Multics Relational Data
Store}, first sold in 1978.
INGRES, Oracle, Sybase, Inc., Microsoft Access, and
Microsoft SQL Server are well-known database products and
companies. Others include PostgreSQL, SQL/DS, and RDB.
["Managing Data Bases, Four Critical Factors" Michael
M. Gorman, QED Information Sciences, Inc.].
["An Introduction To Database Systems" (6th ed) C. J. Date,
Addison Wesley (an excellent source of detailed info)].
["An End-User's Guide to Data Base" James Martin, Prentice
Hall (excellent place to begin learning about DBMS)].
(2002-06-10)
|
relational database management system
(foldoc) | relational database
RDBMS
relational database management system
relational DBMS
(RDBMS - relational database management system) A
database based on the relational model developed by
E.F. Codd. A relational database allows the definition of
data structures, storage and retrieval operations and
integrity constraints. In such a database the data and
relations between them are organised in tables. A table is
a collection of rows or records and each row in a table
contains the same fields. Certain fields may be designated
as keys, which means that searches for specific values of
that field will use indexing to speed them up.
Where fields in two different tables take values from the same
set, a join operation can be performed to select related
records in the two tables by matching values in those fields.
Often, but not always, the fields will have the same name in
both tables. For example, an "orders" table might contain
(customer_id, product_code) pairs and a "products" table might
contain (product_code, price) pairs so to calculate a given
customer's bill you would sum the prices of all products
ordered by that customer by joining on the product-code fields
of the two tables. This can be extended to joining multiple
tables on multiple fields. Because these relationships are
only specified at retreival time, relational databases are
classed as dynamic database management system.
The first commercial RDBMS was the {Multics Relational Data
Store}, first sold in 1978.
INGRES, Oracle, Sybase, Inc., Microsoft Access, and
Microsoft SQL Server are well-known database products and
companies. Others include PostgreSQL, SQL/DS, and RDB.
["Managing Data Bases, Four Critical Factors" Michael
M. Gorman, QED Information Sciences, Inc.].
["An Introduction To Database Systems" (6th ed) C. J. Date,
Addison Wesley (an excellent source of detailed info)].
["An End-User's Guide to Data Base" James Martin, Prentice
Hall (excellent place to begin learning about DBMS)].
(2002-06-10)
|
relational dbms
(foldoc) | relational database
RDBMS
relational database management system
relational DBMS
(RDBMS - relational database management system) A
database based on the relational model developed by
E.F. Codd. A relational database allows the definition of
data structures, storage and retrieval operations and
integrity constraints. In such a database the data and
relations between them are organised in tables. A table is
a collection of rows or records and each row in a table
contains the same fields. Certain fields may be designated
as keys, which means that searches for specific values of
that field will use indexing to speed them up.
Where fields in two different tables take values from the same
set, a join operation can be performed to select related
records in the two tables by matching values in those fields.
Often, but not always, the fields will have the same name in
both tables. For example, an "orders" table might contain
(customer_id, product_code) pairs and a "products" table might
contain (product_code, price) pairs so to calculate a given
customer's bill you would sum the prices of all products
ordered by that customer by joining on the product-code fields
of the two tables. This can be extended to joining multiple
tables on multiple fields. Because these relationships are
only specified at retreival time, relational databases are
classed as dynamic database management system.
The first commercial RDBMS was the {Multics Relational Data
Store}, first sold in 1978.
INGRES, Oracle, Sybase, Inc., Microsoft Access, and
Microsoft SQL Server are well-known database products and
companies. Others include PostgreSQL, SQL/DS, and RDB.
["Managing Data Bases, Four Critical Factors" Michael
M. Gorman, QED Information Sciences, Inc.].
["An Introduction To Database Systems" (6th ed) C. J. Date,
Addison Wesley (an excellent source of detailed info)].
["An End-User's Guide to Data Base" James Martin, Prentice
Hall (excellent place to begin learning about DBMS)].
(2002-06-10)
|
relational language
(foldoc) | relational language
Any kind of programming language that specifies
output in terms of some property and some arguments. For
example, if Tom has two brothers, Dick and Harry, a relational
language will respond to the query "Who is Tom's brother?"
with either Dick or Harry. Notice that unlike {functional
languages}, relational languages do not require a unique
output for each predicate/argument pair. Prolog is the
best known relational language.
(2004-05-17)
|
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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