ORA-12992: cannot drop parent key column ORACLE 报错 故障修复 远程处理
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。