I think there can be only one null value for a unique key constraint but some say there can be more than one null value.

ammupriyaa

 Profile Answers by ammupriyaa Questions by ammupriyaa

• Aug 22nd, 2008

Can have any number of NULL values, since oracle maintains internally different values for each NULL values.

ersanthos

 Profile Answers by ersanthos Questions by ersanthos

• Aug 21st, 2008

Unique key accept only one null values.

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