Hello!
I have found mistake in documentation on version 7.2. Tutorial.
[tutorial-7.2-A4.pdf]
In chapter 3.3 (Foreign Keys) i have found the next mistake:
CREATE TABLE weather (
city varchar(80) references weather,
.....
);
There must be next string:
city varchar(80) references cities,
Sorry for bad English :)
Good Luck!
mailto:john@rus.izvestia.ru