imageboards

Hey ^EXPERT _PROGRAMMERS
I want to make something that'll archive the imageboards I want. I know the text field is limited to 2000 characters, but what about the name/mail/subject ones? Oh, and how does it work with unicode characters?

If I were to select * from posts where id>1000, would that just skip over posts 1..999? Or would it check every post from 1..999 to see if the id is over 1000?