A relationship R connecting entity sets E and F has referential integrity from E to F, i.e., the edge connecting R and F has an arrow directed towards F. Which among the following statements may be true?
A. R is many-to-many from E to F
B. R is many-to-one from E to F
C. R is many-to-one from F to E
D. R is one-to-one from E to F
Answer:B
A relationship R connecting entity sets E and F has referential integrity from E to F, i.e., the edge connecting R and F has an arrow directed towards F. Which among the following statements may be true?
A. R is many-to-many from E to F B. R is many-to-one from E to F C. R is many-to-one from F to E D. R is one-to-one from E to F