[MySQL PHP] How would you go about with a comment system

I was wondering if anybody could get me some pointers on what would be the best way to make a comment system for blog entries. I’m using mysql and php. Would i need to have a field in my entries table that had a specific number or somethign then, a field in a comment table that carried the same id? but if I were to do that, it would overwrite the ID stored when a new comment is added.

Any input as how I could begin making this would be greatly appreciated! :smiley: