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$ mysql.server start Starting MySQL . ERROR! The server quit without updating PID file (/usr/local/var/mysql/fdipzonedeMacBook-Air.local.pid). 180718 18:50:00 InnoDB: If you tried to add new data ...

sudo mysql -uroot -p show databases; create database firstDB; use firstDB; select database(); # 查看当前使用数据库 drop database firstDB; # 删除数据库 show tables;