Mac终端ERROR: The server quit without updating PID file (/usr/local/var/mysql/MacBook-Air.local.pid).

Problem solving:

1. Enter the command: sudo chown -R _mysql /usr/local/var/mysql
2. Restart again: sudo mysql.server restart

Related Mysql errors;

The following error occurs when entering mysql
ERROR 1045 (28000): Access denied for user ''@'localhost' (using password: NO)
Problem description: Insufficient permissions

Solution

Terminal command line
sudo su
input password
su -
get root authority - super administrator authority
At this point, you can run the mysql command normally