sql查询以基于条件求和数据

Question

我的表数据总和如下

---------------------
Building   | Area m2
---------------------
|Dante 12  |   10
|Dante 10  |    5
|Dante 9   |    2
|Crandley  |   20
|Bence     |   30

我想对“建筑面积”求和，但是像“％dante％”这样的建筑物要合并成“ Dante”之和，如下所示：

-------------------
Building | Area m2
-------------------
Dante    |  17
Crandley |  20
Bence    |  30

Answer 1

按大小写分组将为给定的示例数据提供诀窍， like此类也可以使用索引

Select 
case when building like 'dante%' then 'Dante' else building end,
sum([area m2])
from
table
group by 
case when building like 'dante%' then 'Dante' else building end

如果其他栏位有数字，您可以先去除数字，然后进行其余的操作，如下所示

;with cte
as
(select REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE
(REPLACE (building, '0', ''),
'1', ''),
'2', ''),
'3', ''),
'4', ''),
'5', ''),
'6', ''),
'7', ''),
'8', ''),
'9', '') as bulding,aream2
 from #temp
)
select building,sum(aream2)
from
cte 
group by 
building

参考文献：
删除在字符串列中找到的数字

Answer 2

仅在要删除数值时有效

要替换的数值（嵌套替换功能最多可扩展到32级）并按列分组。

SELECT x.Building, SUM(x.AreaM2) AS [Area m2]
FROM (
    SELECT 
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE(
        REPLACE (Building, '0', '')
        ,'1', '')
        ,'2', '')
        ,'3', '')
        ,'4', '')
        ,'5', '')
        ,'6', '')
        ,'7', '')
        ,'8', '')
        ,'9', '') [Building], AreaM2 FROM Buildings) AS x
GROUP BY x.Building