标题: ORA-01451: column to be modified to NULL cannot be modified to NULL [打印本页] 作者: admin 时间: 2016-7-17 14:27 标题: ORA-01451: column to be modified to NULL cannot be modified to NULL ORA-01451: column to be modified to NULL cannot be modified to NULL
Cause: the column may already allow NULL values, the NOT NULL constraint is
part of a primary key or check constraint. Action: if a primary key or check constraint is enforcing the NOT NULL
constraint, then drop that constraint.