一：第一种：
select (@i:=@i+1) as i,table_name.* from table_name,(select @i:=0) as it
例如：
（1）简单实例：select (@i:=@i+1) i,user_id from spcp_user_20170803 ,(select @i:=0) as it ORDER BY t.user_id desc;
（2）复杂实例：
SELECT
(@i:=@i+1) as i,hs_cd,hs_owner_persons,hs_owner_certy_num,hs_full_addr,t5.value_name as hs_type,t6.value_name as hs_owner_type,hs_use_size,hs_build_size,t2.cj_num,t2.db_num,t2.high_age_num,t2.ls_person_num,t7.value_name as person_type,t4.org_name
FROM
house_info_20170803 t1,house_person_info_20170803 t2,person_info_20170803 t3,cmp_org t4,cfg_value t5,cfg_value t6,cfg_value t7,(select @i:=0) as it
WHERE
t1.hs_owner_certy_num IN (
SELECT
hs_owner_certy_num
FROM
house_info_20170803
GROUP BY
hs_owner_certy_num
HAVING
COUNT(*) > 1
)
and t1.hs_id=t2.hs_id
and t2.hs_id=t3.old_hs_id
and t1.tt_org_id=t4.org_id
and (t1.hs_type=t5.value_cd and t5.item_cd='HS_TYPE')
and (t1.hs_owner_type=t6.value_cd and t6.item_cd='HS_OWNER_TYPE')
and (t3.person_type=t7.value_cd and t7.item_cd='PERSON_TYPE');
二、第二种：
set @rownum=0;
select @rownum:=@rownum+1 as rownum, t.* from table_name t order by t.id desc limit 10
（1）简单实例
set @rownum=0;
select @rownum:=@rownum+1 as rownum, t.hs_id from house_info_20170803 t order by t.hs_id desc limit 10
