Subschema can be used to
A. create very different, personalized views of the same data
B. present information in different formats
C. hide sensitive information by omitting fields from the sub-schema's description
D. All of the above
Answer:A
Subschema can be used to
A. create very different, personalized views of the same data B. present information in different formats C. hide sensitive information by omitting fields from the sub-schema's description D. All of the above