sql - SQL、分组依据、合并字符串

Question

我有这张桌子：

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

我想得到

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

所以我想求和 count1 和 sum count2 并按名称分组但合并地址（因为每个名称的地址总是相同的）

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

所以你想按姓名和地址分组：

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

基本上是GROUP BY 合并记录。

Answer 3

使用以下查询。您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 玩

Answer 4

这是 SQL 聚合 101（我还在学习，顺便说一句）：

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

Answer 5

如果您不喜欢按解决方案进行双重分组，您也可以使用 select inside from：

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