NVL( ) Function Example

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

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