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select nullif((1=2),false), nullif((1!=2), true), (nullif((1=2),false) is null), (nullif((1!=2),true) is null); select c1, c2, c1 is null, c2 is null from ( select nullif((1=2),false) c1, nullif((1!=2), true) c2 ) sq; select nullif(3,5), nullif(5,5), nullif(false, false), nullif(false, true);

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