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1.
Multiple Choices. (2points
脳
10)
(1)
If relation R has n tuples and relation S has m tuples, the maximum number of tupes that R
鈹�
S can contain i
s _____.
A. n
B. m
C. n+m
D. |n-m|
(2)
Whi
ch of the followi
ng statements are true.
I. 4NF implies BCNF
II. BCNF implies 3NF
.
III. 3NF implies BCNF
A. None
B. I only
C. I and II
D. I and III
(3)
The FD
X -> Y
i
s a full dependency in a relation R, i
f there is _____ attribute
A
that can be _____
X
and the
dependency still holds.
A. at least one, added to
B. at l
east one, removed from
C. no, added to
C. removed from
(4)
An excl
usive l
ock on a data i
tem represents permi
ssi
on to perform whi
ch of the operations, read and wri
te, on the
data item?
A. Both read and write.
B. Wri
te onl
y
.
C. Read only
.
D. Nei
ther read nor wri
te.
(5)
For two tables to be uni
on compatible, corresponding col
umns from each table should have whi
ch of the followi
ng?
A.
different domai
ns
B.
different names
C.
the same domai
n
D.
the same name