Question:What exactly is a Super key? 

A A Super key is a column or a set of columns that uniquely identifies rows in a table 
B A Super key checks the number of columns in a table which have non-null values 
C A Super key is used to match columns in other tables 
D A Super key checks the number of rows in a table which have non-null values 

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A 

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Md. Habib Ullah

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