Cynicide

Hi everyone, I\'m designing a database for a news/reviews site and I have created tables for all the article types in the site. Features - News - Previews - Reviews - Rants I want all of these to share a primary key field that auto increments. I just can\'t find any place that documents how to get this working. Would I have to make a new table called Index and put the primary key field in that and make all the other tables reference that one? Any help or pointers to examples would be great! Thanks, Cynicide