Explanation:The query ¬P negates the value of P . 5. “Find all students who have taken all courses offered in the Biology department.” The expressions that matches this sentence is :
A. Э t ε r (Q(t))
B. ∀ t ε r (Q(t))
C. ¬ t ε r (Q(t))
D. ~ t ε r (Q(t))
Answer:A
Explanation:The query ¬P negates the value of P . 5. “Find all students who have taken all courses offered in the Biology department.” The expressions that matches this sentence is :
A. Э t ε r (Q(t)) B. ∀ t ε r (Q(t)) C. ¬ t ε r (Q(t)) D. ~ t ε r (Q(t))
Explanation:∀ is used denote “for all” in SQL. 6. Which of the following is the comparison operator in tuple relational calculus