mysql - 在 MySQL 结果集中包含一个额外的计数器

Question

我可以在 MySQL 结果集中包含一个额外的计数器吗？我有以下查询，它返回两列。我需要一个额外的列(仅在结果中)指示结果集中每一行的行。

select orderid, round(sum(unitprice * quantity),2) as value
from order_details
group by orderid
order by 2 desc
limit 10

我需要如下内容:

10865 1 17250.00
11030 2 16321.90
10981 3 15810.00
10372 4 12281.20
10424 5 11493.20

Answer 1

试试这个:

SET @counter = 0; 
Select sub.*
FROM
(
    select orderid, (@counter := @counter +1) as counter,
      round(sum(unitprice * quantity),2) as value
    from order_details
    group by orderid
) sub
order by 2 desc