In contemporary databases the top level of the hierarchy consists of ______, each of which can contain _____.
A. Catalogs, schemas
B. Schemas, catalogs
C. Environment, schemas
D. Schemas, Environment
Answer:A
In contemporary databases the top level of the hierarchy consists of ______, each of which can contain _____.
A. Catalogs, schemas B. Schemas, catalogs C. Environment, schemas D. Schemas, Environment