Question

我有这张桌子：

name    count1    count2   address
John      5         0      London
John      0         3      London
Phil      1         0      Paris

我想要

name    count1    count2   address
John      5         3      London
Phil      1         0      Paris

所以我想总结count1和sum count2和group by name但合并地址（因为每个名字的地址总是相同的）

Answer 1

您需要按姓名和地址分组：

SELECT name, address, sum(count1), sum(count2)
FROM table
GROUP BY name, address

Answer 2

因此，您希望按名称分组和地址：

select name, sum(count1)as count1, sum(count2)as count2, address
from dbo.table
group by name, address;

基本上GROUP BY 合并记录。

Answer 3

使用以下查询。如何包含地址实际上取决于您使用的数据库。

select name, sum(count1) count1,sum(count2) count2 ,address
from table1
group by name, address

SQLFiddle to play with

Answer 4

这是SQL聚合101（我还在学习，顺便说一下）：

select name, sum(count1), sum(count2), address
from mytable
group by name, address;

Answer 5

如果你不喜欢解决方案的双重组，你也可以使用select inside：

select distinct temp.name, temp.count1, temp.count2, t.address
from mytable t, (select t2.name, sum(t2.count1) as count1, sum(t2.count2) as count2
                 from mytable t2
                 group by t2.name) as temp
where t.name = temp.name

SQL，Group by，合并字符串

5 个答案: