Discussion :: Oracle Database MCQs
- What is true about Unique and primary key?
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A.
Unique can have multiple NULL values but Primary can't have.
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B.
Unique can have single NULL value but Primary can't have even single.
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C.
Both can have duplicate values
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D.
None of the Mentioned
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Answer : Option B
Explanation :
primary key doesn't allow Null values and Unique key allows Null value, but only one Null value.
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