Weak entity
In a relational database, a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a primary key of an entity it is related to. In IDEF1X, a government standard for capturing requirements, possible are:
* Complete subtype relationship, when all categories are known.
* Incomplete subtype relationship, when all categories may not be known.
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Weak entity
In a relational database, a weak entity is an entity that cannot be uniquely identified by its attributes alone; therefore, it must use a foreign key in conjunction with its attributes to create a primary key. The foreign key is typically a primary key of an entity it is related to. In IDEF1X, a government standard for capturing requirements, possible are:
* Complete subtype relationship, when all categories are known.
* Incomplete subtype relationship, when all categories may not be known.
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In a relational database, a we ...... cascading updates and deletes.
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In einer relationalen Datenban ...... adierendes Löschen garantiert.
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В реляційних базах даних слабк ...... скадні оновлення та вилучення.
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في قواعد البيانات العلائقية، ن ...... ر التحديثات المتتالية والحذف .
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In a relational database, a we ...... l categories may not be known.
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In einer relationalen Datenban ...... ige starke Entität existieren.
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В реляційних базах даних слабк ...... категорії можуть бути відомі.
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في قواعد البيانات العلائقية، ن ...... تكون العلاقات من النوع المشتق:
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Schwache Entität
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Weak entity
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كيان ضعيف
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