FROM act_user_relation u LEFT JOIN act_info i ON i.ID = u.ACT_ID
LEFT JOIN (SELECT count(1) signupNum, re.ACT_ID from act_user_relation re WHERE re.DEL_FLAG = '0' AND re.`STATUS` != 'refused' AND re.`STATUS` != 'canceled' GROUP BY re.ACT_ID) c ON c.ACT_ID = i.ID