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.