Which of the following binary operations will ALWAYS produce equal number of records as in R or more number of records than in R?
A. R U S
B. R / S
C. R - S
D. R ∩ S
Answer:A
Which of the following binary operations will ALWAYS produce equal number of records as in R or more number of records than in R?
A. R U S B. R / S C. R - S D. R ∩ S