SQL:查找每个组的最大记录 [英] SQL: Find the max record per group

问题描述

可能重复:
检索每个组中的最后一条记录

Possible Duplicate:
Retrieving the last record in each group

我只有一个表，其中有三个字段和数据.

I have one table, which has three fields and data.

Name  , Top , Total
cat   ,   1 ,    10
dog   ,   2 ,     7
cat   ,   3 ,    20
horse ,   4 ,     4
cat   ,   5 ,    10
dog   ,   6 ,     9

我想为每个Name选择具有最高Total值的记录，所以我的结果应该是这样的:

I want to select the record which has highest value of Total for each Name, so my result should be like this:

Name  , Top , Total
cat   ,   3 ,    20
horse ,   4 ,     4
Dog   ,   6 ,     9

我尝试了按总数进行按名称分组，但它给出了按结果分组的最高记录.有人可以引导我吗?

I tried group by name order by total, but it give top most record of group by result. Can anyone guide me, please?

推荐答案

select
  Name, Top, Total
from
  sometable
where
  Total = (select max(Total) from sometable i where i.Name = sometable.Name)

或

select
  Name, Top, Total
from
  sometable
  inner join (
    select max(Total) Total, Name
    from sometable
    group by Name
  ) as max on max.Name = sometable.Name and max.Total = sometable.Total

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