Question

我想计算上一年的增长百分比。

表格结构：

CustomerName | Sum_1415 | Sum_1516

我试过这个问题：

select CustomerName, SUM(Sum_1415), SUM(Sum_1516), 
    round(sum(Sum_1516)-Sum(Sum_1415)/(select sum(Sum_1415) from dummy),2) as Percentage 
from dummy 
group by CustomerName 
order by Sum_1415 desc 
limit 15

Answer 1

仅使用(select sum(Sum_1415) from dummy)替换子查询sum(Sum_1415)。否则，您需要计算每个客户的增长率与上一年度所有收入的总和，而不是该客户的总数。

在ROUND调用中，您还在减法sum(Sum_1516)-Sum(Sum_1415)周围丢失了一些括号。

select CustomerName, SUM(Sum_1415) AS Sum_1415, SUM(Sum_1516) AS Sum_1516, 
    round((sum(Sum_1516)-Sum(Sum_1415))/SUM(Sum_1415),2) as Percentage 
from dummy 
group by CustomerName 
order by Sum_1415 desc 
limit 15

我可能会将其重构为子查询，因此没有必要继续重复SUM表达式。

SELECT CustomerName, Sum_1415, Sum_1516, ROUND((Sum_1516-Sum_1415)/Sum_1415, 2) AS Percentage
FROM (SELECT CustomerName, SUM(Sum_1415) AS Sum_1415, SUM(Sum_1516) AS Sum_1516
      FROM dummy
      GROUP BY CustomerName
      ORDER BY Sum_1516 DESC
      LIMIT 15) AS x

计算上一年和当前年度之间的增长百分比

1 个答案: