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