[a] The relations of two sub-entity sets of the same super entity set have 1-The

Question

[a] 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 [b] The condition A = B in a WHERE clause of an SQL query, where A is an attribute in relation R 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 = B except when B has a NULL value 4- For all values of A and B where A = B except when A and B have NULL values 5- All of the above 6- None of the above [c] The condition A

Explanation / Answer

A. 5 all of the above

B.4 except when A& B have null values

C.2

D.6 None of the above

E.5 all of the above

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.