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Weak entity

In a relational database, a weak entity is an entity that can't be uniquely identified by its own attributes alone, and therefore must use as its primary key both its own attributes and the primary key of an entity it is related to. A weak entity set is indicated by a bold rectangle (the entity) connected by a bold arrow to a bold diamond (the relationship).



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French resistance

... 5 1944, BBC broadcasted a group of unusual sentences. Abwehr and Wehrmacht knew they were code words – possibly for the invasion. All over the France resistance groups ...

 
 
 
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