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mysql
Add a user
CREATE USER 'newuser'@'localhost' IDENTIFIED BY 'password'; GRANT ALL PRIVILEGES ON * . * TO 'newuser'@'localhost'; FLUSH PRIVILEGES;
Grant multiple permissions
GRANT [type of permission] ON [database name].[table name] TO ‘[username]’@'localhost’;
Revoke permissions
REVOKE [type of permission] ON [database name].[table name] FROM ‘[username]’@‘localhost’
Delete user
DROP USER ‘demo’@‘localhost’;