If exp is NULL, value is returned. If exp is not null, exp is returned. The possible data type or types of value must be compatible with the data type of exp.
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Replaces NULL with the value specified for value. Exp is the expression to check for NULL. Value is the value returned if exp is NULL. Exp is returned if it is not NULL. The data type of value must be compatible with the data type of exp.
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NULLIF returns exp1 if the two expressions are not equivalent. If the expressions are equivalent, NULLIF returns a NULL value.
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