A model developed by Hammer and Mc Leod in 1981.
A. SDM
B. OODBM
C. DDM
D. RDM
Answer:A
A model developed by Hammer and Mc Leod in 1981.
A. SDM B. OODBM C. DDM D. RDM
Explanation: SDM stands for Semantic Data Model. It models both data and their relationships in a single structure.