Question

我目前在下面的查询中可以按城市（不包括伦敦）查看销售情况。

SELECT
City, 
SUM(Sales) as Total
FROM Employees
WHERE City != 'London'
Group BY City

当前输出

City            Total    
Kirkland          3         
Redmond           4         
Seattle           9        
Tacoma            2

我需要在下面创建第三列“百分比”（％，无小数点）。你能帮我这个忙吗？提前非常感谢您！

所需的输出

City            Total    Percentage
Kirkland          3         17%
Redmond           4         22%
Seattle           9         50%
Tacoma            2         11%

Answer 1

请尝试以下查询。

SELECT
City, 
SUM(Sales) as Total
FROM Employees
WHERE City != 'London'
Group BY City

The result will be;
   City            Total
   Kirkland          3
   Redmond           4
   Seattle           9
   Tacoma            2

要计算百分比，

DECLARE @Total INT
SELECT @Total=SUM(Sales) FROM Employees WHERE City != 'London'

SELECT
 City, 
 SUM(Sales) as Total,
 CAST(SUM(Sales) * 100 / CAST(@Total AS DECIMAL(18,2)) AS DECIMAL (18,2))
FROM Employees
WHERE City != 'London'
Group BY City

Answer 2

将ELSE部分更改为0

SELECT
City, 
SUM(CASE WHEN City <> 'London' THEN Sales ELSE 0 END) as Total
FROM Employees
Group BY City

或者为什么不排除值为City的{{1}}

London

基于总计计算坡度

2 个答案: