Explanation:∀ is used denote “for all” in SQL. 6. Which of the following is the comparison operator in tuple relational calculus
A. ⇒
B. =
C. ε
D. All of the mentioned
Answer:A
Explanation:∀ is used denote “for all” in SQL. 6. Which of the following is the comparison operator in tuple relational calculus
A. ⇒ B. = C. ε D. All of the mentioned
Explanation:The comparison operators are (<, ≤, =, =, >, ≥). 7. An expression in the domain relational calculus is of the form