Question

希望将“返回”和“总计”列分开，以获得最多返回产品的退货率。这就是我所拥有的，如何在别名上添加除法函数？

SELECT brand
    ,model
    ,count(*) Total
    ,sum(case when returned = 'Y' then 1 else 0 end) as Returned
    ,sum(case when returned = '' then 1 else 0 end) as Kept

FROM table
WHERE year= '2018'
AND NOT type = 's'
GROUP by model

ORDER by Returned DESC;

由于

Answer 1

您可以将其包含在另一个SELECT

中

SELECT brand
    ,model
    ,count(*) Total
    ,sum(case when returned = 'Y' then 1 else 0 end) as Returned
    ,sum(case when returned = '' then 1 else 0 end) as Kept
    ,(SELECT Returned/Total) as Rate
FROM table
WHERE year= '2018'
AND NOT type = 's'
GROUP by model
ORDER by Returned DESC;

Answer 2

你可以这样做。

SELECT brand
    ,model
    ,count(*) as Total
    ,sum(case when returned = 'Y' then 1 else 0 end) as Returned
    ,sum(case when returned = 'Y' then 1 else 0 end)/count(*) as returnRate
    ,sum(case when returned = '' then 1 else 0 end) as Kept

FROM table
WHERE year= '2018'
AND NOT type = 's'
GROUP by model
ORDER by Returned DESC;

划分别名：SQL

2 个答案: