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The SELECT statement SELECT 'Hi' FROM DUAL WHERE NULL = NULL; Outputs
- AHi
- BFLASE
- CTRUE
- DNothing
Correct answer: D
Discussion 1
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CCommunity
Nothing
Since Null is not a member of any data domain, it is not considered a "value", but rather a marker (or placeholder) indicating the absence the value. Because of this, comparisons with Null can never result in either True or False, but always in a third logical result,as Unknown. So, comparing NULL with NULL results to NULL.
Since Null is not a member of any data domain, it is not considered a "value", but rather a marker (or placeholder) indicating the absence the value. Because of this, comparisons with Null can never result in either True or False, but always in a third logical result,as Unknown. So, comparing NULL with NULL results to NULL.