MacOS High Sierra MySQL Error : error while setting value - mysql

Question

I upgrade OS X to High Sierra.
After upgrade, I found some services does not working correctly, which uses MySQL.
I try to connect by
mysql -u root -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
So I try to restart mysql service by
brew services start mysql
Could not find domain for
Error: Failure while executing; `/bin/launchctl enable gui/503/homebrew.mxcl.mysql` exited with 112.
mysql.server start
ERROR! The server quit without updating PID file (/usr/local/var/mysql/mangoui-Mac-mini.local.pid).
/usr/local/var/mysql/mangoui-Mac-mini.local.err
2018-07-27T05:32:37.570411Z 0 [ERROR] [MY-011071] [Server] /usr/local/opt/mysql/bin/mysqld: Error while setting value 'ONLY_FULL_GROUP_BY,STRICT_TRANS_TABLES,NO_ZERO_IN_DATE,ERROR_FOR_DIVISION_BY_ZERO,NO_AUTO_CREATE_USER,NO_ENGINE_SUBSTITUTION' to 'sql_mode'
Interesting point is
sudo brew services start mysql
command works.
So I tried
sudo mysql -u root -p
ERROR 2002 (HY000): Can't connect to local MySQL server through socket '/tmp/mysql.sock' (2)
still get same error.

Answer 1

Please note that brew has recently upgraded mysql to 8.0, which causes some things to break due to deprecations (in my case 'sql_mode').
If you want to stay with 8.0, you can have a look at:
https://dev.mysql.com/doc/refman/8.0/en/upgrading.html
which will guide you through.
If you (for instance for compatibility reasons) decides to stay with e.g. 5.7 you can do e.g.:
> brew services stop mysql
> brew switch mysql 5.7.21
> brew services start mysql
> brew pin mysql # Tell brew to stay on this version
To see which version you have installed you can type:
> brew list --versions mysql
Good luck! Hope this helps :-)