SQL-两个值的除法

在SQL中，我有一个事务数据集。我能够使用两个单独的聚合函数（见下文）获得人员A的销售额和总销售额

如何获得销售人员占总销售额的百分比

总销售额

SELECT SUM(sales) AS total_sales
FROM table;

SELECT SUM(sales) AS Sales_Person_A
FROM table
WHERE salesperson = salespersonA;

个人A的销售额

SELECT SUM(sales) AS total_sales
FROM table;

SELECT SUM(sales) AS Sales_Person_A
FROM table
WHERE salesperson = salespersonA;

---

使用条件聚合：

SELECT SUM(CASE WHEN salesperson = @salespersonA THEN sales END) * 1.0 / SUM(sales)
FROM table;

如果希望所有销售人员都能使用此功能，请使用聚合和窗口功能：

select salesperson, sum(sales),
       sum(sales) * 1.0 / sum(sum(sales)) over ()
from table
group by salesperson;

---

您可以使用

subquery

进行

totalSales

SELECT (SUM(sales)/(SELECT SUM(sales) AS total_sales
FROM table)) * 100 + '%' as Sales_Person_A_Percentage 
FROM table
WHERE salesperson = salespersonA;