ORA-02449: unique/primary keys in table referenced by foreign keys

如果drop表的時候 發生了02449
→要先找出正要刪的表 被哪個外來鍵引用

SELECT A.*
FROM user_constraints A,
  user_constraints B
WHERE b.table_name      = '表名'
AND a.constraint_type   = 'R'
AND a.r_constraint_name = b.constraint_name;