mysql - 强制 group by 保持行的原始顺序

Question

我有这样的查询结果:

24
1
24
11
11
11
13
24
24
11
24
11
24
11
11
13
24
24
11
11
13
21
21
11
11
11
11
11
7
11
11

我需要对这个结果进行分组，但是如果我简单地按这个 id 进行分组，mysql也会按如下方式排序:

1
2
3
4

我想要的是:

24
1
11
13
21

。 。 .

这可能吗？

完整的查询是这个，基本上它根据给定的坐标计算内部有商家的最近路线:

select * from (select dr.*  from drivers_route dr inner join businesses_drivers_route bdr on dr.id_drivers_route = bdr.fk_id_drivers_route inner join  (select * from (select b.idbusiness, 
       b.trading_as,  
       111.1111 *
       DEGREES(ACOS(COS(RADIANS(53.33841959999999))          * COS(RADIANS(b.latitude))
         * COS(RADIANS(-6.2876401 - b.longitude))
         + SIN(RADIANS(53.33841959999999))
         * SIN(RADIANS(b.latitude)))) AS distance_in_km from business b inner join business_category bc on bc.fk_idbusiness = b.idbusiness where b.status_reg = 'A'   and bc.status_reg = 'A'   and bc.fk_idcategory=44) as b_dist order by b_dist.distance_in_km) as b_ord on b_ord.idbusiness = bdr.fk_id_bus_destination) as r_ord;

Answer 1

您可以通过在查询中添加计数器来做到这一点，如下所示:

设置@c=0; SELECT my_field,(@c := @c +1) as c FROM my_table group by my_field order by c;

但正如 Strawberry 所说，最好有一个唯一的主键，这样您就可以使用它。