Question

我需要计算SQL中的总百分比我有

customerID，数量

我所尝试的是：

SELECT 
   customer_id, 
   sum(quantity) / (quantity * 100)
FROM MyTable
Group by customer_id

Answer 1

您需要总计来计算百分比，因此请使用子查询。为避免为每个用户重复计算总数，请将交叉连接计算为计算一次的总数：

select customer_id, quantity * 100 / total
from MyTable 
cross join (
    select sum(quantity) total
    from MyTable) x

Answer 2

您需要先获得总数量才能计算客户数量百分比。

DECLARE @TotalQty int
set @TotalQty = (select sum(Amount) FROM tbltemp)    
SELECT id, Amount * 100 / @TotalQty  FROM tbltemp

Answer 3

尝试fiddle

之类的内容

SELECT customer_id, (sum(quantity) / count(quantity ) * 100)
FROM MyTable 
Group by customer_id

Answer 4

最有效的方法是使用sum () over。试试这个。

SELECT 
   customer_id, 
   (quantity * 100)/sum(quantity) over() 
FROM MyTable

Answer 5

只需使用子选择：

Select customer_id, quantity, quantity / sum(quantity) * 100 per
From
(SELECT customer_id, 
   sum(quantity) quantity
FROM MyTable
Group by customer_id) a

Answer 6

DECLARE @TotalQty int
SET @TotalQty = (SELECT SUM(Amount) FROM tbltemp)    
SELECT id, Amount * 100 / @TotalQty  FROM tbltemp

SQL中同一列的百分比

6 个答案: