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Databases

Descripción

AS Levels (6. Database Systems) A2 ICT - Use and Impact of ICT Mapa Mental sobre Databases, creado por Henry Cookson el 15/12/2014.
Henry Cookson
Mapa Mental por Henry Cookson, actualizado hace más de 1 año
Henry Cookson
Creado por Henry Cookson hace más de 9 años
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Resumen del Recurso

Databases
  1. Flat-file
    1. Single table of data
      1. Limited use from one pool of data
        1. Data redundancy: data can be entered over and over again like customer details for every order
      2. Relational Databases
        1. Advantages
          1. Data redundancy
            1. Data consistency
              1. Password access to allow access to certain areas for certian employees
              2. Two or more tables
                1. With links
                  1. Primary keys
                    1. Foreign keys
                2. Verification and Validation
                  1. Proof reading
                    1. Double entry
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