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MySQL:MySQL不能删除外键，抱错Error on rename of ./ruler/test2child to ./ruler/#sql2-298-92 (errno: 152)
曾经这是MySQL的一个bug，但是现在只是MySQL的一个不友好的地方。
例子如下：
mysql> ALTER TABLE ruler.test2child DROP FOREIGN KEY test;
ERROR 1025 : Error on rename of ''./ruler/test2c
