a) Collection of logically related records.
b) DBMS creates a file that contains description about the data stored in the database.
c) Attribute that can uniquely identify tuples in a relation
d) Special value that is stored when actual data value is unknown for an attribute.
e) An attribute which can uniquely identify tuples of the table but is not defined as primary key of the table.
f) Software that is used to create, manipulate and maintain a relational database.
b) Meta-data or Data Dictionary
c) Primary Key
e) UNIQUE Key