No, Mysql does. Postgres doesn't. (edit, at least, some common mysql table types do) (further edit -- You don't actually need a primary key in postgres. You m

No, Mysql does. Postgres doesn't. (edit, at least, some common mysql table types do) (further edit -- You don't actually need a primary key in postgres. You might want one, and depending on how you do it, it's generally good design, but there's no actual requirement for them.)