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First thing is what is the meaning of Num? There is no attribute like this in the second table. However, I assumed that it meant ID attribute. If it is, then the answer should be 2 as there are two field matched(3412,2341). But the Accepted answer is 1. Am I missing something?
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Basics of Sets and Relations #7
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First thing is what is the meaning of
Num
? There is no attribute like this in the second table. However, I assumed that it meantID
attribute. If it is, then the answer should be2
as there are two field matched(3412
,2341
). But the Accepted answer is1
. Am I missing something?