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Keys

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AS Level ICT A LEVEL Mind Map on Keys, created by CGreen1997 on 21/01/2014.
CGreen1997
Mind Map by CGreen1997, updated more than 1 year ago
CGreen1997
Created by CGreen1997 over 10 years ago
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Resource summary

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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