The fact that all employees of a particular organization should not have salaries more than $10000 is a _____ constraint.
Answer: C
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Which of the following is not a logical database structure?
Answer: A
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Tree structures are used to store data in
Answer: C
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The rule that a value of a foreign key must appear as a value of some specific table is called a
Answer: A
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Which of the following relational algebraic operations is not from set theory?
Answer: D
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Consider the join of relation R with a relation S. If R has m tuples and S has n tuples, then the maximum and minimum size of the join respectively are
Answer: C
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The ______ key of a relation is the attribute (column) or collection of attributes, which uniquely identify a given tuple.
Answer: A
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The size of a data item is called its _______, which can be a field of some record or may be a larger unit such as a record.
Answer: B
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In E-R Diagram total participation is represented by
Answer: A
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In SQL the word natural can be used with
Answer: C
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