Explanation:This query has two “there exists” clauses in our tuple-relational-calculus expression, connected by and (∧). 4. Which of the following symbol is used in the place of except ?
A. ^
B. V
C. ¬
D. ~
Answer:A
Explanation:This query has two “there exists” clauses in our tuple-relational-calculus expression, connected by and (∧). 4. Which of the following symbol is used in the place of except ?
A. ^ B. V C. ¬ D. ~
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 :