null_spec 

Syntax

<null_spec> ::= NULL '<valLITERAL>'

'<valLITERAL>'

Null value representation; maximum length of 20 characters

The default value in the Replication Manager is: ?                    (a question mark and 19 space characters).

Use

This is a syntax rule for describing data access.

Use it to specify the character string used to represent null values, which were loaded from the database instance, in data files.

You can also change the current value for individual commands.