Hi,
This sounds like a very trivial bit of PHP/MySQL work that just about any developer could do. It'd probably take an hour if that.
So, given that fact, why pick me? Pick me for my communication skills, my almost fanatical attention to detail and perfectionism, my timeliness and my professionalism. Sounds like hyperbole I'm sure but read my reviews and you'll see I'm quite sincere.
Hire me, you won't regret it.
Kind regards,
Chris