mySQL Database Duplicate Entry Remover

Hello, I have a mySQL database with over 1 million entries (rows) I need a programmer, in php, or any language - to build a de-duper script to automatically delete duplicate data in mySQL (while keeping the 1 single original row of data) I can give more details to the coder/programmer on the table format etc. -- but what I'm looking for here is a de-duper. Thanks for reading and this is something I need done right away.