Add a NULL to a changegroup
int sqlite3changegroup_change_null(sqlite3_changegroup*, int, int);
This function is similar to sqlite3changegroup_change_int64(). Except that it configures the change currently under construction with a NULL value instead of a 64-bit integer.
See also lists of Objects, Constants, and Functions.
SQLite is in the Public Domain.
https://sqlite.org/session/sqlite3changegroup_change_null.html