In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :
A. Operationally, if Y is deleted, so is X
B. existence is dependent on Y.
C. Operationally, if X is deleted, so is Y.
D. Operationally, if X is deleted, & remains the same.
Answer:C
In an E-R, Y is the dominant entity and X is a subordinate entity. Then which of the following is incorrect :
A. Operationally, if Y is deleted, so is X B. existence is dependent on Y. C. Operationally, if X is deleted, so is Y. D. Operationally, if X is deleted, & remains the same.