org.axiondb.functions
public class NullIfFunction extends BaseFunction implements ScalarFunction, FunctionFactory
The result of using NULLIF(e1,e2) is the same as using the expression
CASE WHEN e1=e2 THEN NULL ELSE e1 END
Version: $Revision: 1.5 $ $Date: 2005/12/20 18:32:28 $
Constructor Summary | |
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NullIfFunction() |
Method Summary | |
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Object | evaluate(RowDecorator row) |
DataType | getDataType() |
boolean | isValid() |
ConcreteFunction | makeNewInstance() |