What is true about Unique and primary key? Options: A . &nbspUnique can have multiple NULL values but Primary can't have. B . &nbspUnique can have single NULL value but Primary can't have even single. C . &nbspBoth can have duplicate values D . &nbspNone of the Mentioned

What is true about Unique and primary key?

Question - What is true about Unique and primary key?

Options:

A . Unique can have multiple NULL values but Primary can't have.

B . Unique can have single NULL value but Primary can't have even single.

C . Both can have duplicate values

D . None of the Mentioned

Answer: Option B

primary key doesn't allow Null values and Unique key allows Null value, but only one Null value.

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