Aptitude Overflow
+1 vote
123 views

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  ?

 

 

asked in Databases by (125 points)  
retagged by | 123 views
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.

1 Answer

+4 votes
Best answer
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
answered by (11.2k points)  
selected by

Related questions

2,609 questions
938 answers
380 comments
31,324 users