MySQL error code 1138:invalid use of NULL value cause and resolution-s

Tabular data I will not give, the specific reason is still: The default value is not set at the beginning of not NULL, and later want to modify the times wrong, because the modification will affect the initialization of many values of the settings, and not uniform, there may be columns allowed to be empty, and some columns are not allowed to be empty. At this point, the following operations can be done. For a more detailed explanation, see here: http://www.zhimengzhe.com/shujuku/MySQL/34845.html

I understand the things, the time will often be ambiguous or to let others do not understand, do not understand, so I will find a solution, understand and digest at the same time with my reference to the article link. This will allow me and the people who see this blog to have a clearer understanding, I also to strengthen the debugging of the error code and long-term record.

MySQL error code 1138:invalid use of NULL value cause and resolution-s