According to the documentations of The Authorizer Action Codes (http://www.sqlite.org/c3ref/c_alter_table.html):
Authorizer Action Codes
/******************************************* 3rd ************ 4th
***********/
<snip>
#define SQLITE_SELECT 21 /* NULL NULL
*/
However, in reality, the callback provides Table Name in the 4th parameter.
Mark

