Question:Identify the incorrect statement/s regarding constraints. 

A A primary key constraint can be disabled 
B Information about the constraints on a table can be retrieved from the data dictionary 
C Information about the columns on which the constraints have been applied can be retrieved from the data dictionary 
D There can be only one unique key in a table 
E If a column has null values then the not null constraint cannot be applied to that column 
F There can be more than one primary key 

+ Answer
D 

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Md. Habib Ullah

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