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Returns a non-null value from two expressions.

NVL(eExpression1, eExpression2)


eExpression1, eExpression2

NVL(В ) returns eExpression2 if eExpression1 evaluates to a null value. NVL(В ) returns eExpression1 if eExpression1 is not a null value. eExpression1 and eExpression2 may be any data type. NVL(В ) returns .NULL. if both eExpression1 and eExpression2 both evaluate to the null value.

Return Value

Character, Date, DateTime, Numeric, Currency, Logical, or the null value


Use NVL(В ) to remove null values from calculations or operations where null values are not supported or are not relevant.


The following example creates a memory variable named glMyNull that contains the null value. NVL(В ) is used to return a non-null value from glMyNull and another expression.

В Copy Code
STORE .NULL. TO glMyNull  && A memory variable containing the null value
? NVL(.T., glMyNull)  && Displays .T.
? NVL(glMyNull, glMyNull)  && Displays .NULL.

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