mysql

MySQL

MySQL All in One

mysql-tutorials

$ mysql -uroot -p

learning tutorials

https://leetcode.com/study-plan/sql/

https://www.sololearn.com/Play/SQL/

https://www.w3schools.com/sql/

https://www.runoob.com/sql/sql-tutorial.html

refs

https://www.cnblogs.com/xgqfrms/p/13586967.html