Choose all of the correct answers for each of the following: the relations of tw

Question

Choose all of the correct answers for each of the following: the relations of two sub-entity sets of the same super entity set have 1- the same keys 2- the same attributes 3- the same constraints 4 the same natural joins with their super entity set 5-All of the above 6- None of the above the condition A = B in a WHERE clause of an SQL query, where A is an attribute in relation and B an attribute in relations S, is true 1- For all values of A and B where A = B 2- For all values of A and B where A = B except when A has a NULL value 3- For all values of A and B where A

Explanation / Answer

well, the answers are

a) 2 and 4

b) 2 , 3 and 4

c)2 ,3 and 4

d) 2 and 4

e)1 and 2

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