Question:Which statement is valid regarding index clusters? 

A Index clusters can only be used for tables with low cardinality columns 
B Index clusters are generally well suited for tables that have many full table scans 
C Normal B-Tree indexes do not store null key values, whereas cluster indexes store null keys 
D A cluster index always takes up much more storage space than a normal index for the same set of key values 

+ Answer
C 

+ Explanation
not sure

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Md. Habib Ullah

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