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Keys

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AS Level ICT A LEVEL Mapa Mental sobre Keys, criado por CGreen1997 em 21-01-2014.
CGreen1997
Mapa Mental por CGreen1997, atualizado more than 1 year ago
CGreen1997
Criado por CGreen1997 quase 11 anos atrás
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Resumo de Recurso

Keys
  1. Primary Key
    1. A field in a database used to identify a record e.g. exam number, NI number etc.
    2. Foreign Key
      1. This is how tables link together in a relational database.
        1. A foreign key is a field in a table that is a primary key in a different table.

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