How To Create a New User and Grant Permissions in MySQL

Step (1.) How to Create a New User :-
we did all of the editing in MySQL as the root user, with full access to all of the databases. However, in the cases where more restrictions may be required, there are ways to create users with custom permissions.
Let’s start by making a new user within the MySQL shell:


CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password';


this point new user has no permissions to do anything with the databases. In fact, if new user even tries to login (with the password, password), they will not be able to reach the MySQL shell.
Therefore, the first thing to do is to provide the user with access to the information they will need.


GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost';


The asterisks in this command refer to the database and table (respectively) that they can access—this specific command allows to the user to read, edit, execute and perform all tasks across all the databases and tables.
Once you have finalized the permissions that you want to set up for your new users, always be sure to reload all the privileges


FLUSH PRIVILEGES;


Step (2.) How To Grant Different User Permissions


ALL PRIVILEGES- as we saw previously, this would allow a MySQL user all access to a designated database (or if no database is selected, across the system)
CREATE- allows them to create new tables or databases
DROP- allows them to them to delete tables or databases
DELETE- allows them to delete rows from tables
INSERT- allows them to insert rows into tables
SELECT- allows them to use the Select command to read through databases
UPDATE- allow them to update table rows
GRANT OPTION- allows them to grant or remove other users' privileges
To provide a specific user with a permission, you can use this framework:


GRANT [type of permission] ON [database name].[table name] TO ‘[username]’@'localhost’;


Each time you update or change a permission be sure to use the Flush Privileges command.
If you need to revoke a permission, the structure is almost identical to granting it:


REVOKE [type of permission] ON [database name].[table name] FROM ‘[username]’@‘localhost’;

Just as you can delete databases with DROP, you can use DROP to delete a user altogether:


DROP USER ‘demo’@‘localhost’;

To test out your new user, log out by typing


quit

and log back in with this command in terminal:


mysql -u [username]-p