慎用create table as select,一定要注意默认值的问题
https://blog.csdn.net/haiross/article/details/17002119
https://blog.csdn.net/haiross/article/details/17002509
https://blog.csdn.net/haiross/article/details/17002119
https://blog.csdn.net/haiross/article/details/17002509