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db:sql_errelationships

ER MODEL - RELATIONSHIPS

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Content:

One-to-one relationships

  • Both entities mandatory
  • One entity mandatory, one optional
  • Both entities optional

One-to-many relationships

  • Both entities mandatory
  • One entity mandatory, one optional

Many-to-many

  • Both entities optional
db/sql_errelationships.txt · Last modified: 2013/03/16 17:40 (external edit)