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If you were creating a primary key on more than one column, you would include both of those column names in th

e parentheses mysql> mysql> CREATE TABLE Orders     -> (     ->     OrderID SMALLINT UNSIGNED NOT NULL,     ->     ModelID SMALLINT UNSIGNED NOT NULL,     ->     ModelDescrip VARCHAR(40),     ->     PRIMARY KEY (OrderID, ModelID)     -> ); Query OK, 0 rows affected (0.00 sec) mysql> mysql> drop table Orders; Query OK, 0 rows affected (0.00 sec)