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In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa. For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In web application frameworks such as CakePHP and Ruby on Rails, a many-to-many relationship between entity types represented by logical model database tables is sometimes referred to as a HasAndBelongsToMany (HABTM) relationship.

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  • Many-to-many (data model)
  • Relation multivaleur
  • Muitos-para-muitos (modelagem de dados)
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  • En , une relation multivaleur détermine que pour chaque enregistrement d'une table, il peut y avoir aucun, un ou plusieurs enregistrements d'une autre table qui lui soit liés. On dit en Anglais une relation many-to-many, plusieurs vers plusieurs, de par la possibilité de lier plusieurs éléments à une entrée. Par exemple, un livre peut être écrit par plusieurs auteurs, et un auteur peut avoir écrit plusieurs livres.
  • In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa. For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In web application frameworks such as CakePHP and Ruby on Rails, a many-to-many relationship between entity types represented by logical model database tables is sometimes referred to as a HasAndBelongsToMany (HABTM) relationship.
  • Em análise de sistemas, um relacionamento muitos-para-muitos (também abreviado como N para N ou N:N) é um tipo de cardinalidade que refere-se ao relacionamento entre duas entidades A e L, no qual A pode conter uma instância pai para a qual existem muitas instâncias filhas em L e vice versa. Por exemplo, pensando-se em A como Autores e L como Livros, um Autor pode escrever vários Livros e um Livro pode ser escrito por vários Autores.
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  • En , une relation multivaleur détermine que pour chaque enregistrement d'une table, il peut y avoir aucun, un ou plusieurs enregistrements d'une autre table qui lui soit liés. On dit en Anglais une relation many-to-many, plusieurs vers plusieurs, de par la possibilité de lier plusieurs éléments à une entrée. Par exemple, un livre peut être écrit par plusieurs auteurs, et un auteur peut avoir écrit plusieurs livres.
  • In systems analysis, a many-to-many relationship is a type of cardinality that refers to the relationship between two entities A and B in which A may contain a parent instance for which there are many children in B and vice versa. For example, think of A as Authors, and B as Books. An Author can write several Books, and a Book can be written by several Authors. In a relational database management system, such relationships are usually implemented by means of an associative table (also known as join table, junction table or cross-reference table), say, AB with two one-to-many relationships A -> AB and B -> AB. In this case the logical primary key for AB is formed from the two foreign keys (i.e. copies of the primary keys of A and B). In web application frameworks such as CakePHP and Ruby on Rails, a many-to-many relationship between entity types represented by logical model database tables is sometimes referred to as a HasAndBelongsToMany (HABTM) relationship.
  • Em análise de sistemas, um relacionamento muitos-para-muitos (também abreviado como N para N ou N:N) é um tipo de cardinalidade que refere-se ao relacionamento entre duas entidades A e L, no qual A pode conter uma instância pai para a qual existem muitas instâncias filhas em L e vice versa. Por exemplo, pensando-se em A como Autores e L como Livros, um Autor pode escrever vários Livros e um Livro pode ser escrito por vários Autores. Em um sistema de gerenciamento de banco de dados relacional, tais relacionamentos são normalmente implementados por meio de uma tabela associativa (também conhecida como tabela de junção ou tabela de referência cruzada). Por exemplo, uma tabela AL possuindo dois relacionamentos A → AL e L → AL. Neste caso, a chave primária lógica para AL é formada de duas chaves estrangeiras (isto é, cópias das chaves primárias de A e L). Em frameworks de aplicações web, como CakePHP e Ruby on Rails, um relacionamento muitos-para-muitos entre tipos de entidades representadas por tabelas de banco de dados do modelo lógico é, algumas vezes, denominado como um relacionamento HasAndBelongsToMany (HABTM), que em português significa Possui E Pertence A Muitos.
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