NULLCHARVAL= Data Set Option

Defines the character string that replaces missing SAS character values during insert, update, DBINDEX=, and DBKEY= processing.
Valid in: DATA and PROC steps (when accessing DBMS data using SAS/ACCESS software)
Default: a blank character
See: NULLCHARVAL= data set option in SAS/ACCESS for Relational Databases: Reference

Syntax

NULLCHARVAL= 'character-string'