Database Systems MCQs – Practice Test 14 (Chapter 21)
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MCQ 66: Taking the instructor's relation into account, the integrity constraint ensures that instructor name cannot be:
MCQ 67: The SQL standard specifies that a transaction begins implicitly when an SQL statement is:
MCQ 68: Value of one relation for a given set of attributes, appearing for a certain set of attributes in another relation, is known as:
MCQ 69: A guard against accidental damage to the database, is known to be:
MCQ 70: For a referential-integrity constraint to make sense, the primary key must be compatible sets of:
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