Question:Can you define variables in PostgreSQL pl/pgSQL whose value cannot be null? 

A No, you cannot 
B Yes, you can use 'NOT NULL' after datatype 
C Yes, you can use 'NON NULLABLE' after datatype 
D Yes, that is the default case, for setting it to hold null values 'NULLABLE' is used after datatype 

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B 

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Md. Habib Ullah

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