Introduction to Database System
In SQL, GRANT command is used to

grant system privileges, roles, and object privileges to uses and roles
allow user to create databases
allow user to access databases
None of the listed here

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Introduction to Database System
In a large DBMS

all of the listed here
each user can "see" only a small part of the entire database
each user can access every sub¬schema
each subschema contains every field in the logical schema

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