Answer Posted / sriniwaas41

dublicate values- means two same values not allowed

primary key:does not allow null values and does not allow
dublicate v
alues
-reapeated values and null values not allowed
-we can use primary key only once in a table

unique key:
-reapeated values not allowed as per primary key.
-but the difference is null values are allowed
-another difference is we can declare more thatn one
unique column in a table.primary is not allowed

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