Keys

Descripción

AS Level ICT A LEVEL Mapa Mental sobre Keys, creado por CGreen1997 el 21/01/2014.
CGreen1997
Mapa Mental por CGreen1997, actualizado hace más de 1 año
CGreen1997
Creado por CGreen1997 hace más de 10 años
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Resumen del 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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