Explanation:None. 9. In domain relaional calculus “there exist” can be expressed as
A. (P1(x))
B. (P1(x)) Э x
C. V x (P1(x))
D. Э x (P1(x))
Answer:A
Explanation:None. 9. In domain relaional calculus “there exist” can be expressed as
A. (P1(x)) B. (P1(x)) Э x C. V x (P1(x)) D. Э x (P1(x))
Explanation:Э is used to denote “some” values in relational calculus. 10. A set of possible data values is called