Question:Which of the following statements are wrong about primary keys? 

A The primary key field must contain unique values 
B The primary key field can contain null values 
C A primary key is the column or set of columns that makes every row in the table unique 
D A primary key can be created with a maximum of three columns 
E Each table can have more than one primary keys 
F Unique key is another name for primary key 

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B D E 

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Md. Habib Ullah

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