Question

slno state district company 
1     a       ab     abc
2     a       ab     ac
3     a       ab     abc
4     a       ab     abc
5     a       ab     abc
6     a       ab     ac

输出

state district company sumzz
 a      ab       abc    4
 a      ab       ac     2

我尝试了什么

select state,district,company,sum(company) as sumzz from company

如何根据不同的公司实现显示最后一行？

Answer 1

编辑：对于更新的问题，您可以在子查询中检索最大slno。然后，您可以使用in来过滤那些：

select  state
,       district
,       company
,       slno
from    Company
where   slno in
        (
        select  max(slno)
        from    Company
        group by
                state
        ,       district
        ,       company
        )

Answer 2

这种方法有什么问题：

  SELECT state, district, company, COUNT(*) as countzz
    FROM company
GROUP BY state, district, company

Answer 3

我认为你试图计算有多少记录而不是总结一些东西。如果这就是你想要的，那么你应该这样做：

SELECT state, district, company, COUNT(*) as sumzz 
FROM company
GROUP BY state, district, company

Answer 4

从公司='abc'

的公司选择州，区，公司，总和（公司）作为sumzz

如何使用mysql选择表中不同值的总和

4 个答案: