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CONSTRAINT ... FOREIGN KEY ... REFERENCES ...
mysql> create table foo (id integer primary key, name varchar(10));
Query OK, 0 rows affected (0.01 sec)
mysql> drop table foo;
Query OK, 0 rows affected (0.00 sec)
There is no Extraterrestrial life
There aren't any suitably capable Extraterrestrials
Interstellar travel is too difficult
We're too uncool / not worth the trouble
What do you mean they haven't visited?
Results (473 votes). Check out past polls.