Ubuntu PHP-fpm not connected with mysql

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////////Ubuntu PHP-fpm not connected with mysql////////////
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Run: sudo mysql;

mysql> SELECT user,authentication_string,plugin,host FROM mysql.user;

mysql> ALTER USER 'root'@'localhost' IDENTIFIED WITH mysql_native_password BY 'yourPassword';

mysql> FLUSH PRIVILEGES;
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////////Ubuntu PHP-fpm not connected with mysql////////////
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If you are using nginx and unable to connect php with mysql in your php code. Try below commands from your terminal