Answers for "GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';"

mysql grant all privileges to a user

GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';

mysql grant all privileges on *.* to 'root'@' ' identified by

mysql> CREATE USER 'root'@'%' IDENTIFIED BY 'PASSWORD';
mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' WITH GRANT OPTION;
mysql> FLUSH PRIVILEGES;

grant all privileges mysql

/*
The GRANT statement is used to assign full control over specific database by providing all priviledge.
Follow below statement for assign priviledge to user
*/

Syntax: 
GRANT ALL PRIVILEGES ON database_name.* TO 'username'@'localhost';

mysql> grant all privileges on *.* to root@localhost identified by 'password' with grant option;

mysql> GRANT ALL PRIVILEGES ON *.* TO 'root'@'%' IDENTIFIED BY 'root' WITH GRANT OPTION;