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Question (with the Answer) or a Multiple Choice Question (with the Answer).
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records
and relationships records and fields records and pointers records and identifiers records and descriptors
IQuestion 3: A
relationship is a(n) __.
" logical
association physical association between two
tables semantic association between two
fields named two dimensional table of
data hierarchical structure of
associations
Question 4: Which of the
following is NOT a restriction/convention in RDBMS? Each
field name in the database must be unique Each relation
must have a unique name Each column in
the table must have the same data type Each column in
the table must be of the same length Each column
name in a table must be unique
Question 5: A primary key is
__. an
attribute that uniquely identifies each row in a relation an attribute in a row that is
identified by other attributes an attribute that is related to
attributes in another relation an attribute that is functionally
dependent on other keys an attribute that is used in
conjunction with other keys to form an identifier.
Question 6: A foreign key is __. an
attribute that uniquely identifies each row in a relation an attribute in a row that is
identified by other attributes an attribute that is related to
attributes in another relation an attribute that is functionally
dependent on other keys an attribute that is used in
conjunction with other keys to form an identifier.
Question 7: Functional
dependence implies: One
attribute can be determined by another One attributes functions only if
another attribute is present One attribute can not exist without
the other No two records can be related to
the same attribute No two attributes can be related to
another attribute
Question 8: A
candidate key is:
a
single attribute that could become a primary key a
composite key that could become a primary key
a foreign key that could become
a primary key
A and B
ALL of the above
Question 9: Entity integrity insures that:
Null
values can not be entered.
All entries must be unique
Foreign keys are includede
All entries have composite keys
Non-key attributes are excluded
Question 10:
In order for an RDBMS to be relationally complete,
it must: Support
entity and referential integrity Support all relational algebra
functions Support only SELECT, PROJECT and
JOIN functions A and B A and C
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