标题: ORA-02442: Cannot drop nonexistent unique key [打印本页] 作者: admin 时间: 2016-7-22 10:52 标题: ORA-02442: Cannot drop nonexistent unique key ORA-02442: Cannot drop nonexistent unique key Cause: alter table drop unique (<col list>) - unique specification does not exist. Action: make sure column list for unique constraint is correct.