Database Management Systems Mcqs
Page No. 6
SELECT name FROM instructor WHERE salary IS NOT NULL; Selects
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A _____ indicates an absent value that may exist but be unknown or that may not exist at all.
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We can test for the nonexistence of tuples in a subquery by using the _____ construct.
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The phrase “greater than at least one” is represented in SQL by _____
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A Boolean data type that can take values true, false, and________
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All aggregate functions except _____ ignore null values in their input collection.
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