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We know that a weak entity has no primary key .


SO ,  A weak entity is an entity that cannot be uniquely identified by its attributes alone . Does it mean it has duplicates and it always a multi-set  ?



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weak entitiy is the entity which does not have any primary key it will be having only partial key hence inorder to convert weak entitiy into relation we will take primary key from strong entity and this partial key and primary key together acts as primary key for this weak entity relation.

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Weak entity normally can be identified in connection with strong entity also . They are connected by an identifying relation. But it does not mean that it should always have duplicates . it need not be always multi set
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