小编Shu*_*Liu的帖子

我在R中使用SQLDF.我从第2列和第3列计算两个不同的值.我想计算第2列/第3列,但结果始终为零.为什么？

这是我的代码:

prouterInboundin4hours<-sqldf(

  " select `1st Segment Delivered Success Day`,   count (DISTINCT case  when 
  `Inbound Lead Time (hour)` < 4 then `First segment Order Number` END) 
  as 'Inbound< 4 hours Volume', 
  count (`First segment Order Number`) as 'Delivered Success Volume',
  count (DISTINCT case  when `Inbound Lead Time (hour)` < 4 then `First 
  segment Order Number` END) / count (`First segment Order Number`) 
  from prouter
   where Year ='Year2017'
  group by `1st Segment Delivered Success Day`
  "
   )

结果是: