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• Relational_database abstract "A relational database is a database that has a collection of tables of data items, all of which is formally described and organized according to the relational model. Data in a single table represents a relation, from which the name of the database type comes. In typical solutions, tables may have additionally defined relationships with each other.In the relational model, each table schema must identify a column or group of columns, called the primary key, to uniquely identify each row. A relationship can then be established between each row in the table and a row in another table by creating a foreign key, a column or group of columns in one table that points to the primary key of another table. The relational model offers various levels of refinement of table organization and reorganization called database normalization. (See Normalization below.) The database management system (DBMS) of a relational database is called an RDBMS, and is the software of a relational database.In relational databases, each data item has a row of attributes, so the database displays a fundamentally tabular organization. The table goes down a row of items (the records) and across many columns of attributes or fields. The same data (along with new and different attributes) can be organized into different tables.The term relational does not just refer to relationships between tables: firstly, it refers to the table itself[citation needed], or rather, the relationship between columns within a table; and secondly, it refers to links between tables. Important columns in any relational database's tables will be a column whose entry (customer ID, serial number) can uniquely identify any particular item or record (the primary key), and any column(s) that link to other tables (the foreign key(s)). The size and complexity of relational databases typically requires stored procedures to support the relationships and provide access (interfaces) to external programs which, for example, "query" the relational database to retrieve and present selected data.Relational databases are both created and queried by DataBase Management Systems (DBMSs). Relational databases displaced hierarchical databases because the ability to add new relations made it possible to add new information that was valuable but "broke" a database's original hierarchical conception. The trend continues as a networked planet and social media create the world of "big data" which is larger and less structured than the datasets and tasks that relational databases handle well (it is instructive to compare Hadoop).".
• Relational_database thumbnail Relational_database_terms.svg?width=300.
• Relational_database wikiPageID "25873".
• Relational_database wikiPageRevisionID "604647542".
• Relational_database hasPhotoCollection Relational_database.
• Relational_database subject Category:1969_introductions.
• Relational_database subject Category:Database_theory.
• Relational_database subject Category:English_inventions.
• Relational_database subject Category:Relational_model.
• Relational_database subject Category:Types_of_databases.
• Relational_database type Genre.
• Relational_database type MusicGenre.
• Relational_database type TopicalConcept.
• Relational_database type Concept.
• Relational_database comment "A relational database is a database that has a collection of tables of data items, all of which is formally described and organized according to the relational model. Data in a single table represents a relation, from which the name of the database type comes. In typical solutions, tables may have additionally defined relationships with each other.In the relational model, each table schema must identify a column or group of columns, called the primary key, to uniquely identify each row.".
• Relational_database label "Banco de dados relacional".
• Relational_database label "Base de datos relacional".
• Relational_database label "Base de données relationnelle".
• Relational_database label "Relational database".
• Relational_database label "Relationale Datenbank".
• Relational_database label "Relationele database".
• Relational_database label "Реляционная база данных".
• Relational_database label "قاعدة بيانات مترابطة".
• Relational_database label "关系数据库".
• Relational_database label "関係データベース".
• Relational_database sameAs Relační_databáze.
• Relational_database sameAs Relationale_Datenbank.
• Relational_database sameAs Σχεσιακή_βάση_δεδομένων.
• Relational_database sameAs Base_de_datos_relacional.
• Relational_database sameAs Datu-base_erlazional.
• Relational_database sameAs Base_de_données_relationnelle.
• Relational_database sameAs 関係データベース.
• Relational_database sameAs 관계형_데이터베이스.
• Relational_database sameAs Relationele_database.
• Relational_database sameAs Banco_de_dados_relacional.
• Relational_database sameAs m.0119v3m2.
• Relational_database sameAs Q192588.
• Relational_database sameAs Q192588.
• Relational_database wasDerivedFrom Relational_database?oldid=604647542.
• Relational_database depiction Relational_database_terms.svg.
• Relational_database isPrimaryTopicOf Relational_database.