ORA-22331: cannot alter an incomplete type
Cause: An attempt was made to perform ALTER TYPE on an incomplete type.
Action: Use CREATE TYPE to completely define the original type before executing the ALTER TYPE.
ORA-22331: cannot alter an incomplete type指的是不能修改一个不完整的类型。
1. 首先，确定错误发生的原因。
2. 然后，确保使用create或replace语法时创建的对象完整。
3.最后，尝试再次运行alter命令。