Usage of mysql exists and not extsts

SELECT  * FROM  me_account_site

  WHERE NOT EXISTS (SELECT * FROM  me_site

                WHERE me_account_site.siteId = me_site.siteId);

 

Note: There is a problem with the order of me_account_site and me_site. When the first position is me_account_site, the second position cannot be repeated, that is, crossed.