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CREATE TABLE Country $($

ISOCode$2$ CHAR$(2)$ NOT NULL,

Population INTEGER,

IndepDate DATE,

IndepYear SMALLINT,

Area DECIMAL $(9,2)$ NOT NULL,

PopDensity DECIMAL $(7,2)$

;

Which columns can contain NULL values?

ISOCode$2$

Population

IndepDate

IndepYear

Area

PopDensity