Prevent error when dropping not existing sequences, creating existing users

Question

I have a bunch of sql scripts that create / drop sequences, users and other objects. I\'m running these scripts through liquibase, but they fail because oracle complains whe

Answer 1

Write a function do_ddl similar to this and catch all exceptions you want to catch:

DECLARE
   allready_null EXCEPTION;
   PRAGMA EXCEPTION_INIT(allready_null, -1451);
BEGIN
   execute immediate 'ALTER TABLE TAB MODIFY(COL  NULL)';
EXCEPTION
   WHEN allready_null THEN
      null; -- handle the error
END;
/