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question about EJB QL

 
vitesse wei
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Question:



Given answer is C,why A,B is wrong?
 
Meherdad Bomanbehram
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Java Netbeans IDE Ubuntu
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Hi,
The Reader entity has 2 entries whereas the book entity has 4 entries.
we want a collection thats less than 4 .
option A will give all the readers from the book entity thats 4 entries
option B will give all the reader entities joined to the book entity thats also 4 .
option C will give all the readers from the reader entity thjat have books . the result set is a collection of 2 hence this is the correct answer.
 
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