"Error: near ".": syntax error" with sqldf in R

Question

出于某种原因，我以前可以工作的代码不再工作了，我收到以下错误消息 "Error: near "。“：语法错误”。代码如下。我应该如何修改它以使其再次工作？ 非常感谢！

uhc_phys <- sqldf("select 
      a.iso3,a.year,a.whoname,a.Phys
      b.iso3,b.year,b.whoname,b.Phys
      min(abs(a.year - b.year)) min_value
    from uhc_hwf a  
    left join uhc_hwf b on a.year - b.year in (0,1,2,3,4,5) and
      a.iso3 = b.iso3 and
      b.Phys is not null
    group by a.iso3, a.year
    having a.year in ('2012','2017')")[1:8]

Answer 1

您在某些所选字段之间缺少逗号。试试这个：

uhc_phys <- sqldf("select 
      a.iso3,a.year,a.whoname,a.Phys        ,
      b.iso3,b.year,b.whoname,b.Phys        ,
      min(abs(a.year - b.year)) min_value
    from uhc_hwf a  
    left join uhc_hwf b on a.year - b.year in (0,1,2,3,4,5) and
      a.iso3 = b.iso3 and
      b.Phys is not null
    group by a.iso3, a.year
    having a.year in ('2012','2017')")[1:8]

（逗号隔开一点以突出显示缺少的内容。）