SELECT *
FROM user u
WHERE u.email = 'johnny@google.com'
	AND u.password = MY_FUNCTION(v, '');



UPDATE user
SET password = SHA2(CONCAT(password_salt, password), 512);




-- select u.* ,  SHA2(CONCAT(u.password_salt, 'a'),512) FROM user as u WHERE u.email = 'johnny@google.com' -- AND u.password = SHA2(CONCAT(u.password_salt, 'a'),512);

update user set password_salt = SUBSTRING(MD5(RAND()), -10);