MySql查詢瀏覽器：爲外鍵更改表

Question

如何使message_id成爲外鍵，使其在註釋和消息之間是一對多的關係？ （一個消息可以有很多評論。）

mysql> use nntp; 
Reading table information for completion of table and column names 
You can turn off this feature to get a quicker startup with -A 

Database changed 
mysql> show tables; 
+----------------+ 
| Tables_in_nntp | 
+----------------+ 
| comments  | 
| messages  | 
+----------------+ 
2 rows in set (0.00 sec) 

mysql> describe comments; 
+------------+---------+------+-----+---------+-------+ 
| Field  | Type | Null | Key | Default | Extra | 
+------------+---------+------+-----+---------+-------+ 
| id   | int(11) | NO | PRI | NULL |  | 
| message_id | int(11) | NO |  | NULL |  | 
| comment | text | NO |  | NULL |  | 
| stamp  | date | NO |  | NULL |  | 
+------------+---------+------+-----+---------+-------+ 
4 rows in set (0.00 sec) 

mysql> describe messages; 
+-----------+---------+------+-----+---------+-------+ 
| Field  | Type | Null | Key | Default | Extra | 
+-----------+---------+------+-----+---------+-------+ 
| id  | int(11) | NO | PRI | NULL |  | 
| newsgroup | text | NO |  | NULL |  | 
| subject | text | NO |  | NULL |  | 
| content | text | NO |  | NULL |  | 
| number | text | NO |  | NULL |  | 
+-----------+---------+------+-----+---------+-------+ 
5 rows in set (0.00 sec) 

mysql> quit 
Bye 
thufir@dur:~/NetBeansProjects/USENET$ 

我使用的是MySQL查詢瀏覽器，看看：

雖然我可以從查詢瀏覽器或命令行中輸入SQL，我對它不是很熟悉。如果可能的話，我寧願使用GUI查詢瀏覽器。

Answer 1

應該做的伎倆：

ALTER TABLE comments ADD FOREIGN KEY (message_id) REFERENCES messages(id); 

正如人們可以從閱讀MySQL documentation告訴。