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INF2603 Assessment 7 2022
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- University Of South Africa (Unisa)
INF2603 Assessment 7 of 2022 (Quiz 4) Questions and answers 100% correct
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Databases 1INF2603
Quiz 4
Assessment 7
Unique Number: 769869
Department of Information Systems
, Question 1
A formulae in predicate calculus cannot comprise.
a. V
b. >
c. Ω
d. <
Question 2
____ yields only the rows that appear in both tables.
a. union
b. difference
c. intersect
d. select
Question 3
There is only one type of relational calculus.
Select one:
True
False
Question 4
If two relations are not union-compatible, then the UNION operator cannot be
applied as the results would be invalid.
Question 5
What is meant by the term union compatibility?
a. When two or more tables share the same number of columns.
b. When two or more tables share the same number of columns and when they
share the same domains.
c. When two or more tables share the same (or compatible) domains.
d. When two or more tables have the same degree.
Question 6
An equijoin which links tables on the basis of an equality condition that
compares specified columns of each table.
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