SQL2012 问题Saving changes is not permitted. （修改表时无法保存）

感谢原文作者: http://blog.csdn.net/yenange/article/details/6569909

弹出如下信息.
Saving changes is not permitted. The changes you have made require the following tables to be dropped and re-created.You have either made changes to a table that can't re-created or enabled the option Prevent saving changes that require the table to be re-created
解决方法:
Tools->Options->Designers->Table options->Prevent saving changes that require the table re-creation

工具->选项->Designers->表选项->阻止保存要求重新创建表的更改

把这一项uncheck (不选)了就行了.