Syntax:
GRANT
    priv_type [(column_list)]
      [, priv_type [(column_list)]] ...
    ON [object_type] priv_level
    TO user_or_role [, user_or_role] ...
    [WITH GRANT OPTION]
    [AS user
        [WITH ROLE
            DEFAULT
          | NONE
          | ALL
          | ALL EXCEPT role [, role ] ...
          | role [, role ] ...
        ]
    ]
}

GRANT PROXY ON user_or_role
    TO user_or_role [, user_or_role] ...
    [WITH GRANT OPTION]

GRANT role [, role] ...
    TO user_or_role [, user_or_role] ...
    [WITH ADMIN OPTION]

object_type: {
    TABLE
  | FUNCTION
  | PROCEDURE
}

priv_level: {
    *
  | *.*
  | db_name.*
  | db_name.tbl_name
  | tbl_name
  | db_name.routine_name
}

user_or_role: {
    user (see https://dev.mysql.com/doc/refman/8.0/en/account-names.html)
  | role (see https://dev.mysql.com/doc/refman/8.0/en/role-names.html)
}

The GRANT statement enables system administrators to grant privileges
and roles, which can be granted to user accounts and roles. These
syntax restrictions apply:

o GRANT cannot mix granting both privileges and roles in the same
  statement. A given GRANT statement must grant either privileges or
  roles.

o The ON clause distinguishes whether the statement grants privileges
  or roles:

  o With ON, the statement grants privileges.

  o Without ON, the statement grants roles.

  o It is permitted to assign both privileges and roles to an account,
    but you must use separate GRANT statements, each with syntax
    appropriate to what is to be granted.

For more information about roles, see
https://dev.mysql.com/doc/refman/8.0/en/roles.html.

To grant a privilege with GRANT, you must have the GRANT OPTION
privilege, and you must have the privileges that you are granting.
(Alternatively, if you have the UPDATE privilege for the grant tables
in the mysql system schema, you can grant any account any privilege.)
When the read_only system variable is enabled, GRANT additionally
requires the CONNECTION_ADMIN privilege (or the deprecated SUPER
privilege).

GRANT either succeeds for all named users and roles or rolls back and
has no effect if any error occurs. The statement is written to the
binary log only if it succeeds for all named users and roles.

The REVOKE statement is related to GRANT and enables administrators to
remove account privileges. See [HELP REVOKE].

Each account name uses the format described in
https://dev.mysql.com/doc/refman/8.0/en/account-names.html. Each role
name uses the format described in
https://dev.mysql.com/doc/refman/8.0/en/role-names.html. For example:

GRANT ALL ON db1.* TO 'jeffrey'@'localhost';
GRANT 'role1', 'role2' TO 'user1'@'localhost', 'user2'@'localhost';
GRANT SELECT ON world.* TO 'role3';

The host name part of the account or role name, if omitted, defaults to
'%'.

Normally, a database administrator first uses CREATE USER to create an
account and define its nonprivilege characteristics such as its
password, whether it uses secure connections, and limits on access to
server resources, then uses GRANT to define its privileges. ALTER USER
may be used to change the nonprivilege characteristics of existing
accounts. For example:

CREATE USER 'jeffrey'@'localhost' IDENTIFIED BY 'password';
GRANT ALL ON db1.* TO 'jeffrey'@'localhost';
GRANT SELECT ON db2.invoice TO 'jeffrey'@'localhost';
ALTER USER 'jeffrey'@'localhost' WITH MAX_QUERIES_PER_HOUR 90;

From the mysql program, GRANT responds with Query OK, 0 rows affected
when executed successfully. To determine what privileges result from
the operation, use SHOW GRANTS. See [HELP SHOW GRANTS].

URL: https://dev.mysql.com/doc/refman/8.0/en/grant.html

