ORA-12992: cannot drop parent key column

文档解释

ORA-12992: cannot drop parent key column

Cause: An attempt was made to drop a parent key column.

Action: Drop all constraints referencing the parent key column, or specify CASCADE CONSTRAINTS in statement.

ORA-12992错误指的是无法删除父键(Parent Key)列。父键是一种外键，可以指向主表中的行。

官方解释

This error would occur when a column that is part of a parent key relationship is attempted to be dropped using DDL operation.

常见案例

一个常见的案例是，用户试图删除一个表中有一个外键约束(Foreign Key Constraint)的列。

正常处理方法及步骤

1、先从外键约束删除父列；

2、然后再在表中删除父键的列；

3、最后把约束再添加回去即可。