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​If It Is Possible for a Subquery to Return a NULL

Question 45

Multiple Choice

​If it is possible for a subquery to return a NULL value to the outer query for comparison,the ____ function should be used to substitute an actual value for the NULL.


A) ​IS NULL
B) ​NVL
C) ​!NVL
D) ​NVLS

Correct Answer:

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