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select nullif((1=2),'f'), nullif((1!=2), 't'), (nullif((1=2),'f') is null), (nullif((1!=2),'t') is null); select c1, c2, c1 is null, c2 is null from ( select nullif((1=2),'f') c1, nullif((1!=2), 't') c2, (nullif((1=2),'f') is null), (nullif((1!=2),'t') is null) ) sq;

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