ребят, в версии 4.0.15 это всё равно не работает:
Ошибка
SQL-запрос :
DELETE FROM user_main, user_data
WHERE user_main.user_visiting IS NULL AND user_main.user_id = user_data.user_id AND user_main.user_registration < \'2005-03-01\'
Ответ MySQL:
#1064 - You have an error in your SQL syntax. Check the manual that corresponds to your MySQL server version for the right syntax to use near \'WHERE user_main.user_visiting IS NULL AND use\'