占总销售成本的15％

Question

难以弄清楚如何计算销售表总数的15％

这是我迄今为止所得到的（总和）。发现在同一查询中显示总销售额和15％销售额的困难..

SELECT SUM(prices) AS total sales FROM sales;

Answer 1

你可以将总和乘以0.15：

SELECT SUM(prices) AS total_sales,
       SUM(prices) * 0.15 AS fifteen_percent
FROM   sales;

Answer 2

SELECT SUM(prices) AS [total sales], ((15.0/100.0) * SUM(prices)) AS [15 percent of sales] FROM sales;