[Phpmyadmin-devel] Suggestions--What to do with previous data in target database when it is about to synchronize with a source database?

Hi, Could any one suggest, whether : Should I ask the user "Do you want to delete the uncommon tables or uncommon rows from the target database/table? " by prompting a message box or dialog box OR Should I make my own assumption that there is no need to delete any previous data in the target database. Regards, Zahra