mysql - MYSQL中如何计算百分比？

Question

我不明白，为什么我得到的是 0.01% 而不是 100%，请指教

这是我的查询:

SELECT Total_Price,concat(round(total_price/(SUM(total_price)*100),2),'%') AS percentage
FROM Sales
WHERE Department IN ('SPORT','MUSIC')
AND DATE BETWEEN '2016-01-01' AND '2016-03-30'

谢谢

Answer 1

尝试将总计作为子查询进行...

select t1.total_price, (t1.total_price/t2.grand_total)*100 as pc
from MyTable t1
inner join
(
select sum(tx.total_price) as grand_total
from MyTable tx
AND tx.DATE BETWEEN '2016-01-01' AND '2016-03-30'
) t2
on 1=1
WHERE Department IN ('SPORT','MUSIC')
AND DATE BETWEEN '2016-01-01' AND '2016-03-30'