schema , subschema

Question

what is schema an subschema in dbms  

a subschema can be used to

a)create very different , personalized views of the same data

b) hide sensitive information by omitting fields from the subschema's description

c)present info'n in various formats

d)none

e)all

Answer 1

The term "schema" refers to the organization of data as a blueprint of how the database is constructed