Copyright: the voice of experience, I do not know whether the change package spicy bar, and the other, please indicate the source. https://blog.csdn.net/zhezhebie/article/details/91351287
View mysql support engine, we all know:
mysql> show engines;
View supported data types:
mysql> ? data types;
View command help:
? command
The official document: https://dev.mysql.com/doc/refman/5.7/en/using-system-variables.html
Related reference: https://www.cnblogs.com/y3010179969/p/6359212.html