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

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