Database error: Invalid SQL: UPDATE lessons l JOIN class c ON (l.class_id = c.class_id) SET l.public_key = md5(CONCAT(c.acc_id, '_', l.class_id, '_', l.lesson_id, '_' ,'sefeip08734r34rf5667')) WHERE l.public_key = ''
MySQL Error: 1054 (Unknown column 'c.acc_id' in 'field list')
includes/oddlib/class.DB_MYSQL.inc: Session halted