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book Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe cover

Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe

النسخة 6الرقم المعياري الدولي: 0136086209
book Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe cover

Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe

النسخة 6الرقم المعياري الدولي: 0136086209
تمرين 12
Consider a relation R(A,B,C,D,E) with the following dependencies:
AB - > C
CD - > E
DE - > B
Is AB a candidate key of this relation? If not, is ABD? Explain your answer.
التوضيح
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No, AB+ = {A,B,C},a ...

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Database Systems 6th Edition by Ramez Elmasri, Shamkant B. Navathe
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