Query MySQL database find missing email addresses

Question

I am trying to extract email addresses from given list, that not persists in MySql database. My query:

SELECT * 
FROM users 
WHERE `user_email` IN ('myemail@email.com', 'my2email@email.com', 'my3email@email.com')

First two email addresses are in database, but the last one is not. My target is to print only emails that are NOT in database. How is that possible?

Answer 1

SELECT * 
FROM (SELECT 'myemail@email.com' user_email
      UNION ALL
      SELECT 'my2email@email.com'
      UNION ALL
      SELECT 'my3email@email.com') emails_to_check_for
LEFT JOIN users USING (user_email)
WHERE users.user_email IS NULL;

Answer 2

create a temporary table and insert all the email ids that you want to check

create table check_emailid(email_id varchar(255))

insert into check_emailid(email_id )
values('myemail@email.com') 
values('my2email@email.com')
values('my3email@email.com')

select * 
from check_emailid 
where email_id not in (SELECT user_email
                       FROM users)