如何解决SQL-如何对重复计数结果求和
我的查询存在一些问题。
我想对员工的位置进行分类并根据地区进行计数,这是我的查询:
SELECT
(CASE
WHEN location = 'India' THEN 'Asia'
WHEN location = 'Italy' THEN 'Europe'
WHEN location = 'Singapore' THEN 'Asia'
WHEN location = 'Australia' THEN 'Australia'
ELSE NULL
END) AS Region,COUNT(location) AS Total_person
FROM
Location_tbl
GROUP BY
location
结果如下:
- 亚洲= 1
- 欧洲= 1
- 亚洲= 1
- 澳大利亚= 1
我想要的结果是这样的:
- 亚洲= 2
- 欧洲= 1
- 澳大利亚= 1
你们能帮我解决问题的方法,以便我得到想要的结果。
解决方法
您需要在group by
-
select
CASE WHEN location in( 'India','Singapore') THEN 'Asia' WHEN location = 'Italy' THEN 'Europe' WHEN location = 'Australia' THEN 'Australia' END as Region,count(location) as Total_person from Location_tbl
group by CASE WHEN location in( 'India','Singapore') THEN 'Asia' WHEN location = 'Italy' THEN 'Europe' WHEN location = 'Australia' THEN 'Australia' END
,
select
Region,count(Region)
from
(select (CASE WHEN location = 'India' THEN 'Asia' WHEN location = 'Italy' THEN 'Europe' WHEN location = 'Singapore' THEN 'Asia' WHEN location = 'Australia' THEN 'Australia' ELSE null END) as Region
from Location_tbl) tab
group by
tab.Region
,
SELECT
location,CASE
WHEN location = 'India' or 'Singapore' THEN 'Asia'
WHEN location = 'Italy' THEN 'Europe'
WHEN location = 'Australia' THEN 'Australia'
ELSE NULL
END AS Region
FROM
Location_tbl
GROUP BY
location
ORDER BY
SUM(location);
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