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>
我做错了什么？
另外，由于某些原因，我在创建表时无法通过mySQL-Workbench创建外键。
没有“添加”按钮或“+”符号来添加此约束。右键单击没有任何反应。
有人可以指出我正确的方向吗？ 我在Gentoo Linux上有Workbench版本6.3.4.0。
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|
+-----------+-----------------------------------------------------------------------------------------------------+-----------+------------+-----------+-----------+-----------+-------------+
+-----------+-----------------------------------------------------------------------------------------------------+-----------+------------+-----------+-----------+-----------+-------------+
答案 0 :(得分：2)
似乎你使用id作为外键而不是使用正确的列
ALTER TABLE owners
ADD COLUMN FOREIGNID INT NOT NULL;
ALTER TABLE owners
ADD FOREIGN KEY (FOREIGNID) REFERENCES leagues(ID);