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Database Systems Study Material: Practice Test 7 (Chapter 15)
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The Quiz: The result of Boolean expression 'true and unknown' is; "Introduction to SQL" App (iOS, Android) with answers: false, true, unknown, and null to learn software engineering courses. Study View of Data Quiz Questions, download Google Book (Free Sample) for online bachelor's degree computer science.
The result of Boolean expression 'true and unknown' is
The query for finding the department names of all instructors, is
If 'A' is null for a particular tuple, then the expression result must also be null for that
SQL prevents any update to the database that violates an
Since duplicate retention is the default, we shall not use
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