mysql触发器中包含select语句问题

select b.flag_price into @flag_price_copy from `dst_111yao_doms`.`d_shop_ware` as a,`dst_111yao_doms`.`d_platform` as b 
where a.pfid = b.pfid and a.olshopid = NEW.olshopid and a.tfid = NEW.pfid and a.warecode = NEW.outter_id and a.skuid = NEW.sku;

if @flag_price_copy = '1' then
        ...

CREATE  TRIGGER  num_in  AFTER  INSERT  ON user_t
FOR   EACH   ROW  BEGIN
--变量的声明
DECLARE num INT(11) ;
--赋值
SET  num = (SELECT  COUNT(id)  FROM user_t) ;
     UPDATE  count_table SET count_num = num , update_time = SYSDATE() 
     WHERE table_name = "user_t" ;
END ;

CREATE  TRIGGER  account_delete_info  AFTER  DELETE  ON sys_account_info
FOR   EACH   ROW  BEGIN
DECLARE deleteid INT(11) ;
-- 保险起见
SET  deleteid = 0 ;
-- 直接获取不到，得先存一下  这是个小坑
SET  deleteid = OLD.id ;
-- 保险起见 ，确保在获得值的时候删除
IF deleteid != 0 THEN
   DELETE from sys_user_info  where sys_user_info.account_id = deleteid ;
END IF ;
END ;

DROP TRIGGER account_delete_info ;