Question:Which of the following statements is/are wrong? 

A Both Primary key and Unique key enforce uniqueness 
B Primary keys create a clustered index by default 
C Both Primary key and Unique key don't allow NULL values 
D Unique keys create a non-clustered index by default 
E It is possible to have more than one Primary key in a table 

+ Answer
C 

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Md. Habib Ullah

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