Database Schema

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Understanding SQL
Barbara Gerwien
Mapa Mental por Barbara Gerwien, actualizado hace más de 1 año
Barbara Gerwien
Creado por Barbara Gerwien hace más de 9 años
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Resumen del Recurso

Database Schema

Nota:

  •   šThis is a complete logical view of the database.   
  1. All tables

    Nota:

    • Relations - All relations are tables but not all tables are relations.
    1. Columns in each table
      1. Primary Key of Each table

        Nota:

        • Primary Key values must be unique in every row. Also known as the Entity Integrity Constraint
        1. Foreign Keys that link the tables together

          Nota:

          • Foreign Key - šA column or composite of columns that is the primary key of a table other than the one in which it appears.   
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