In the abstraction of a database system the external level is the
physical level
logical level
conceptual level
view level
A relational database developer refers to a record as
criteria
relation
tuple
attribute
Key to represent relationship between tables is called
primary key
candidate key
foreign key
alternate key
Abstraction of the database can be viewed as
two levels
four levels
three levels
one level
In the relational model, cardinality is the
number of tuples
number of attributes
number of tables
number of constraints
Cartesian product in relational algebra is
a unary operator
a binary operator
a ternary operator
not defined
