MySQL中创建FOREIGN KEY

Question

ALL，

igor@IgorDellGentoo ~ $ isql myodbc-5.2-test root wasqra 
+---------------------------------------+ 
| Connected!       | 
|          | 
| sql-statement       | 
| help [tablename]      | 
| quit         | 
|          | 
+---------------------------------------+ 
SQL> use draft; 
SQLRowCount returns 0 
SQL> ALTER TABLE owners ADD FOREIGN KEY id REFERENCES leagues(id); 
[ISQL]ERROR: Could not SQLExecute 
SQL> 

我在做什么错？

此外，出于某种原因，创建表时，我无法通过mySQL-Workbench创建外键。

没有“添加”按钮或“+”号来添加此约束。对右键没有反应。

有人能请我指出正确的方向吗？ 我在Gentoo Linux上安装了Workbench 6.3.4.0版本。

SQL> show tables; 
+-----------------------------------------------------------------+ 
| Tables_in_draft             | 
+-----------------------------------------------------------------+ 
| leagues               | 
| owners               | 
+-----------------------------------------------------------------+ 
SQLRowCount returns 2 
2 rows fetched 
SQL> SELECT * FROM leagues; 
+-----------+-----------------------------------------------------------------------------------------------------+-----------+------------+-----------+-----------+-----------+-------------+ 
| id  | name                        | drafttype | scoringtype| roundvalue| leaguetype| salary | benchplayers| 
+-----------+-----------------------------------------------------------------------------------------------------+-----------+------------+-----------+-----------+-----------+-------------+ 
+-----------+-----------------------------------------------------------------------------------------------------+-----------+------------+-----------+-----------+-----------+-------------+ 

Answer 1

好像你正在使用的ID作为外键使用适当的立柱，而不是

ALTER TABLE owners 
ADD COLUMN FOREIGNID INT NOT NULL; 

ALTER TABLE owners 
ADD FOREIGN KEY (FOREIGNID) REFERENCES leagues(ID);