281598 two simple php/mysql scripts

I need the following two simple php/mysql scripts: The first script should check a mysql table for 0 values in a specific column, and should replace them. This should be run via a cronjob and should create a log. The second script should compare values of a xml file with values of a mysql database and has to generate a sql code with the values that are missing in the database and should output differences. Everything has to work without a bug, and I need it asap.